Threads Marketing · 13 min read

Cracking the Threads Algorithm: Why Replying to Comments Can Boost Your Reach by 42%

Threads Algorithm Reply Depth Strategy

You’re Posting Every Day, But Reach Is Still Below Expectations? The Problem Might Not Be Your Content

The daily workflow for many Hong Kong brand social media managers looks like this: craft a carefully designed post, pair it with a polished image, brainstorm a few hashtags, then hit publish… and wait. Wait for likes, wait for comments, wait for reach to climb.

On Threads, however, this entire workflow is fundamentally wrong.

According to Meta’s official data and multiple third-party analyses, the Threads algorithm doesn’t reward “how much you post” — it rewards “how much real conversation your posts generate.” More precisely, the metric the algorithm values most is “Reply Depth” — how many layers deep users reply to each other, and how many layers deep you reply back.

This mechanism has completely rewritten the rules of social media marketing. Adam Mosseri (Head of Instagram and Threads) has stated explicitly: “Threads isn’t optimised for likes — it’s optimised for conversation.” A post with 10 deep conversations will vastly outperform a post with 100 likes but zero comments.

This article breaks down: why reply depth matters so much, how to leverage this mechanism to amplify your brand’s word-of-mouth, and how Hong Kong brands can apply these strategies in practice.

How Does the Threads Algorithm Calculate “Reach”? Three Key Signals

To understand why replies matter so much, you first need to understand the Threads algorithm’s logic. According to industry analysis, Threads determines a post’s reach through three steps:

Step 1: Inventory Gathering

The algorithm first filters all available content on the platform to identify posts potentially relevant to each user — including accounts they follow, accounts with similar interests, and topic preferences inferred from past interaction behaviour.

Step 2: Signal Analysis

Every post is scored across hundreds of “signals.” However, not all signals carry equal weight. The Threads algorithm ranks signal importance as follows:

  1. Reply Depth (multi-layered conversations where users reply to each other, not just the brand replying)
  2. Engagement Velocity (engagement gained within 30 minutes is more valuable than engagement over 24 hours)
  3. Reposts and Shares
  4. Likes (surprisingly ranked low)
  5. Profile Visits

Step 3: Value Prediction Ranking

The algorithm predicts which content is most likely to spark further interaction, then pushes high-prediction posts to more users’ “For You” feeds — crucially, these users are not necessarily your followers.

The implication: an account with just 300 followers can achieve reach of 500,000 or even over a million impressions, as long as the post sparks deep conversation. QSearch data from Taiwan shows that Hong Kong user accounts with only 200 followers have achieved 130,000 reach on a single post; accounts with 300–500 followers have reached 570,000 to 1.7 million.

Why Are Replies So Critical? Because the Algorithm Rewards “Speed” and “Depth”

Let’s look at the data:

The mechanism behind these numbers is “Reply Depth.”

Consider two scenarios:

Scenario A: You publish a post and receive 50 likes within 10 minutes, but zero comments. The algorithm’s verdict: the content is eye-catching but insufficient to spark discussion. Reach will gradually decay within hours.

Scenario B: You publish a post and receive only 20 likes in 30 minutes, but already have 15 comments. You immediately reply to 5 of them, prompting 3 users to reply back. Two of those conversations extend to 4 layers deep. The algorithm’s verdict: this is a “high-value conversation,” and it immediately pushes the post to more non-followers with related interests. This is where Threads’ viral spread begins.

Key insight: Replies aren’t “extra work” — they’re the trigger that activates the algorithm.

According to content marketing agency PostEverywhere, actively replying to comments within the first hour after posting can increase reach by up to 3x. The reason: each reply resets the algorithm’s “freshness score,” pushing the post back into the “recently active” content pool. Deep conversations also trigger the algorithm’s cross-promotion to “interested clusters.”

Hong Kong Brands’ Core Challenge: 68.4% of Users Don’t Follow Brand Accounts

Here’s a statistic that shocks many Hong Kong marketing managers: according to Hungry Digital’s survey of Hong Kong Threads users, 62.5% of Hong Kong Threads users don’t follow any brand accounts at all, and 68.4% prefer following personal accounts over brand accounts.

There’s an even more sobering figure: 87.5% of Hong Kong Threads users rely solely on the algorithm-recommended For You feed rather than their curated Following list, with 93.75% expressing satisfaction with the algorithm’s recommendations.

What this means: on Threads, a brand’s follower count is virtually meaningless. Whether you have 500 followers or 50,000, every post’s reach depends on the same thing: whether the algorithm believes your post will spark conversation.

This perfectly explains the now-classic case of SC Storage CEO Kevin Shee. He ran an experiment: using both his personal account and the company’s official account, he simultaneously published identical coupon offers. The result? Nearly all coupons from the personal account were claimed; not a single coupon from the official account was redeemed. This experiment revealed a core truth about Hong Kong’s Threads market: personal voice far outperforms institutional voice.

And reply depth is precisely the most direct path for brand accounts to “develop a personal voice.”

How to Build an Effective Reply Strategy: 5 Practical Methods

1. Master the Golden 60 Minutes: Enter Battle Mode the Moment Your Post Goes Live

The first hour after publishing is the critical window that determines subsequent reach. Here’s the recommended workflow:

Think of this window like a live TV interview — once prime time passes, there’s no going back.

2. Replace “Statements” with “Questions” as Your Post’s Core

Taiwan’s Hachiyo Tea’s social media manager grew the brand’s Threads followers to 52,000 in 2024 — triple their Instagram count — with a 20% revenue increase in the first half of the year. One of their core secrets: replacing statements with questions.

Wrong: “Our coffee uses 100% Arabica beans” Right: “Quick poll: when you choose coffee beans, do you care about the variety? Or is the flavour description more important?”

The first sentence is virtually guaranteed to sink on Threads; the second can generate dozens to hundreds of stacked replies. Questions are fuel for the algorithm.

3. “Sea Patrol” Strategy: Proactively Join Conversations Instead of Waiting for Them to Come to You

GU Taiwan (under Japan’s Fast Retailing Group) has mastered this strategy. When users discuss the GU × Chiikawa collaboration, GU’s social media manager doesn’t wait for comments on their official account. Instead, they proactively search for keywords like Chiikawa, GU, and collaboration, then drop comments on users’ posts: “On sale at 9 — set your alarms!”

This proactive approach is known as “sea patrol” in Taiwan’s marketing industry. Hachiyo Tea’s CEO Liu Cheng-yi famously said: “As long as our logo appears in the thread, that already counts as advertising for us.”

For Hong Kong brands, the “sea patrol” strategy can be implemented as follows:

4. Build a “Social Media Manager Persona”: Brand Accounts Can Have Personality Too

How do you transform a cold corporate account into one with genuine “human warmth”? The key is establishing a clear social media manager persona.

Hachiyo Tea created “Yao-tou” — a character with a world-weary, sarcastic office worker humour. McDonald’s Taiwan, PX Mart, IKEA Taiwan, FamilyMart — all the successful brand accounts on Threads share one thing in common: their social media managers have a consistent, recognisable, distinctive voice.

Core elements for building a social media manager persona:

For Hong Kong brands, the persona can incorporate local elements: Hong Kong-style humour, observations about daily life (riding the MTR, queuing to buy things, ordering at a cha chaan teng). These elements help the algorithm identify your posts as “Hong Kong content,” pushing them to more local users.

5. The 30/70 Rule: 30% Brand Content + 70% Conversation Content

This is the “30/70 Rule” developed by Hachiyo Tea’s marketing team and widely validated across the industry: your brand’s content mix should be 30% brand-related + 70% everyday life, entertainment, or emotionally resonant content.

This ratio reflects a core truth: users come to Threads for conversation and entertainment, not to browse your product catalogue. When your account is “an interesting presence” 70% of the time, users are naturally more willing to engage when you post that 30% of brand content.

For resource-constrained Hong Kong SMEs, this ratio can be implemented as: out of 10 weekly posts, roughly 3 discuss products, services, or promotions, while the remaining 7 cover industry observations, daily stories, opinions on current events, user interactions, or even casual chat.

Real Case Study: How a Hong Kong User with 300 Followers Achieved 570,000 Reach

One of the most inspiring cases: a Hong Kong woman with only about 300 followers casually posted about purchasing feminine care products, accompanied by a photo taken at the store shelf and a receipt.

That single post achieved in one day: 570,000 views, 700+ likes, and 2,100 reposts.

The algorithm mechanics behind it:

  1. The post’s authenticity triggered strong resonance among female users
  2. Early comments included users sharing their own purchasing experiences, sparking second-layer conversations
  3. Female users began replying to each other with product recommendations, forming multi-layered conversation chains
  4. The algorithm identified this as a “highly active female interest topic” and pushed it to non-followers in related interest groups
  5. The topic spread to adjacent interest clusters — beauty, lifestyle, hygiene
  6. Secondary amplification: users took screenshots and shared them on Instagram Stories and other platforms

This case perfectly illustrates one thing: on Threads, follower count is not the determining factor — conversation depth is. A regular user with 300 followers can outperform official brand accounts with tens of thousands of followers — provided their content sparks genuine conversation.

Common Mistakes: The 3 Reply Traps Hong Kong Brands Fall Into Most

Trap 1: Copy-Paste Replies

“Thanks for the support~” “Welcome back~” “Thank you!” — these canned replies are identified as “invalid engagement” by both users and the algorithm. Users won’t reply again, and conversation depth drops to zero.

The right approach: Every reply should be unique and tailored to the specific user’s comment. Even something as simple as “That’s an interesting point — actually, it depends on the situation” is ten times more effective than “Thanks for the support.”

Trap 2: Replying More Than 6 Hours Late

We’ve seen far too many Hong Kong brands operate like this: post at 10 AM, then the social media manager goes to handle other tasks and returns at 5 PM to batch-reply to everything.

The problem: The algorithm’s “freshness score” has already decayed. Users have long scrolled past. Your replies can no longer restart the conversation.

The right approach: Align your Threads posting time with your social media manager’s availability. If they can’t dedicate focus to replying within the first hour after posting, delay the post.

Trap 3: Overly Corporate Replies

“Our company sincerely appreciates your valuable feedback. We will carefully review and implement improvements.” — this tone on Threads is equivalent to declaring “I am not a real person.”

The right approach: Reply in a conversational tone, even when handling complaints or negative comments. Use emoji (but don’t overdo it), and show that there’s a real person with real emotions behind the account.

Conclusion: A Threads Reply Strategy Is Essential for Hong Kong Brands in 2026

The window for Threads’ organic traffic advantage is gradually narrowing. Meta launched global advertising on Threads in April 2025, with industry forecasts projecting Threads ad revenue at US$8 billion in 2025 and US$11.3 billion in 2026. As ad monetisation matures, today’s organic reach advantage will progressively compress.

But over the next 12–18 months, that window remains open. As QSearch’s analysis puts it: “If social platforms were city streets, Facebook would be a gradually quieting old neighbourhood, X would be a noisy ideological battlefield, and Threads would be that corner alley you occasionally wander into to see what everyone’s chatting about — and before you know it, you’ve joined in.”

For Hong Kong brands, Threads’ true value isn’t conversion rates — it’s conversation. Brands that master the reply depth strategy in 2026 will possess a word-of-mouth amplification engine that competitors can hardly replicate. And the most important point: this capability doesn’t require a massive media budget — it requires a mindset shift, from “publisher” to “conversationalist.”

Is your brand ready to shift from “posting” to “conversing”?

Want to learn more about building brand word-of-mouth on Threads? 10Lab offers professional Threads word-of-mouth marketing services — from strategy planning to execution — helping brands go viral on Threads.

We’re Hong Kong’s only guaranteed-traffic Threads word-of-mouth marketing company. If we don’t deliver, you don’t pay.

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