Platform Deep Dives & Algorithms
Each app has its own “algorithm” that decides who sees your post — learn what each one rewards so your content fits the platform.
What you will learn
- Explain in plain words what a social algorithm is
- Name what each major platform rewards
- Adapt one piece of content to fit different platforms
What is an “algorithm”?
When you open Instagram or YouTube, you do not see every post in time order. Instead the app uses an algorithm — a set of rules that ranks posts and decides which ones to show each person, and in what order. Its goal is simple: keep you watching by showing you things you will like.
For a marketer, this matters hugely. The algorithm is the gatekeeper between your post and new viewers. If your content gives the app what it rewards, it shows your post to more people — for free. So the trick is to learn what each platform rewards and give it exactly that.
What every algorithm watches
Although each app differs, they all watch the same basic signals. The more of these your post earns, the wider it spreads:
- Watch time / dwell time — how long people look at or watch your post.
- Engagement — likes, comments, shares and especially saves and sends.
- Completion — for video, whether people watch to the end (or rewatch).
- Speed — how fast a new post earns engagement in its first hour.
A handy rule: shares and saves are worth more than likes, because they tell the app your post was genuinely useful, not just pretty.
A platform-by-platform cheat sheet
Here is what each major platform rewards, and the content that fits. Find the row for the platform you use and aim your posts at that column:
| Platform | What its algorithm rewards | Best content to make |
|---|---|---|
| Reels, saves, sends, fast engagement | Short vertical Reels, carousels, strong hooks | |
| YouTube | Watch time + click-through on the thumbnail | Clear titles, good thumbnails, videos that hold attention |
| TikTok | Completion & rewatches; pushes new accounts | Snappy native-feeling videos, trending sounds |
| Comments & “dwell” on text posts; professional value | Stories/lessons from work, short text posts, no outbound links in post | |
| Meaningful comments, posts shared in groups | Community posts, events, local group sharing | |
| Fresh pins, keyword-rich descriptions (acts like search) | Tall image pins, how-to graphics, clear keywords | |
| X / Threads | Replies and reposts; fast public conversation | Short punchy text, timely takes, threads |
Note: This table is not code — it is a reference card. Notice the patterns: video apps (Instagram, YouTube, TikTok) reward how long people watch; conversation apps (LinkedIn, X, Threads) reward comments and replies; and Pinterest behaves more like a search engine, so keywords matter there. Match your content to the right column and the algorithm does your marketing for you.
One idea, reshaped for three platforms
You should not post the exact same thing everywhere — each app rewards a different shape. Here is a single bakery idea (“how to keep cake fresh in summer”) reshaped to fit three platforms. Read each line as “same idea, platform-friendly form”:
Core idea: How to keep a cake fresh in summer
Instagram -> a 20-second Reel: quick tips with on-screen
text and trending audio (rewards watch time)
YouTube -> a 3-minute video: "5 ways to store cake in
heat", clear title + bright thumbnail
LinkedIn -> a short text post: "A summer lesson from
running a bakery..." ending with a question
(rewards comments)Note: This is a planning note you can copy. The idea is identical, but the FORM changes to match each algorithm: a fast Reel for Instagram, a searchable titled video for YouTube, and a conversation-starting text post for LinkedIn. This is how professionals get more from one idea — they adapt it instead of copy-pasting it.
Tip: Post in the native format of each app. A video filmed tall for Reels feels at home on Instagram and TikTok but looks awkward as a sideways YouTube upload. Apps quietly favour content made for them over reposts that obviously came from elsewhere.
Watch out: Algorithms change often, and chasing every tiny update will exhaust you. Do not obsess over rumours. The signals above (watch time, saves, comments, completion) have stayed important for years — focus on earning those, not on hacks.
Q. On most platforms, which action usually signals your post is most valuable to the algorithm?
✍️ Practice
- Pick two platforms you use and write down, from the cheat sheet, exactly what each one rewards.
- Take one content idea and reshape it for Instagram, YouTube and LinkedIn (one line each).
🏠 Homework
- Choose a business and its main platform. Write 3 post ideas designed specifically for that platform’s algorithm, and explain in one line why each fits.