Social Media Marketing Guide: TikTok, Instagram and LinkedIn
Which social media marketing guide path fits your next decision?
Updated
This social media marketing guide starts with your audience, because the audience decides which platform gets your next hours of work.
Each platform has its own feed rules, and two of the playbooks carry terms-of-service warnings. Read the decisions here, then open the TikTok, Instagram or LinkedIn playbook for setup and tactics.
Related guides: LinkedIn algorithm 2026: how the feed ranks posts, TikTok growth strategy: setup, hooks and content formats, Instagram growth: the four-phase launch protocol, Meta Ads guide: Andromeda, creative strategy and CAC.
Where to Start in This Social Media Marketing Guide
Your goal sets the platform order. Pick the goal that matches your next decision, then read the warnings on the TikTok and Instagram pages before you take any step they describe.
Goal 1: Win B2B pipeline
- LinkedIn algorithm 2026: start here when your buyers are professionals. The 2026 feed rules set how far a post travels, and the page shows which formats win.
- TikTok growth strategy: read it second if you plan creator-led video for the same audience. It covers creator sourcing and the hooks that hold attention.
Goal 2: Reach people with short video
- TikTok growth strategy: start here. Its hook and format sections decide what your first videos look like. Read its location warning in the account setup section before you set up any account.
- Instagram growth: read it next if you plan to add an Instagram account for the same videos. Its four-phase launch protocol carries a terms-of-service warning near the top, and that warning applies to every step on the page.
Goal 3: Launch a new account
- Instagram growth: read its terms-of-service warning first. Platform terms apply to every launch step, so do not treat those steps as approved practice.
- TikTok growth strategy: read the location-tools warning in its account setup section first. Then use its hook and format sections to plan the first posts.
Which Platform Fits Your Audience
Match the platform to where your audience already spends time. Use adult usage shares to judge reach, then confirm the fit with your own audience data.
In Pew Research Center's 2025 survey of 5,022 US adults, 84% say they ever use YouTube. The survey ran from February 5 to June 18, 2025.
Pew's 2025 report gives ever-use shares for five platforms. Use them as a reach check, not as a buyer count.
Share of US adults who ever use each platform
| Platform | Ever use, 2025 | Playbook |
|---|---|---|
| YouTube | 84% | No GrowthVector guide yet |
| 71% | No GrowthVector guide yet | |
| 50% | Instagram growth | |
| TikTok | 37% | TikTok growth strategy |
| 32% | No GrowthVector guide yet |
Daily use is a separate measure. About a quarter of US adults, 24%, say they use TikTok every day, in a separate survey of 5,123 adults run from February 24 to March 2, 2025. TikTok's ever-use share rose from 21% in 2021 to 37% in 2025.
Pew's question is whether adults ever use a platform. That measures reach, not whether your buyers are there, and not how long they spend on it.
Pew's sample is adults in general. A B2B buyer list, a niche consumer group or a local audience needs its own numbers, because a national share can point the wrong way for them.
Decision rules for platform choice
- If your buyers make business purchases, start with LinkedIn, then test short video on TikTok or Instagram for reach.
- If your product sells to people who already watch short video, test TikTok and Instagram before you add a third platform.
- If your analytics show that one platform already sends you most visits, put the next hours there before you open a new one.
- If no platform fits your analytics, run a small test on one platform for a fixed period, and compare the result with your current traffic source.
How Each Feed Decides Reach
Use each platform's stated signals as a checklist for your format, not as a guarantee of reach. The platforms publish different amounts of detail about how they rank posts.
Instagram says it has no single algorithm that decides what people see. Each surface ranks content on its own, so plan Feed and Reels separately.
For Feed, Instagram lists these inputs, roughly in order of importance: your activity, information about the post, information about the person who posted, and your history of interacting with that person.
For Reels, the list starts with your activity and your history with the poster, then covers information about the reel and about the poster.
Meta's Reels page gives example inputs, including reel length, similarity to other reels, the time people spend viewing the reel, and how often it is viewed with sound on. Meta says these inputs change frequently.
Plan Reels around viewing time, since Meta's list names it. Check Meta's list again whenever your Reels reach shifts.
LinkedIn's March 12, 2026 newsroom post says the Feed now uses larger sequence models, known as Generative Recommenders, with large language models. The models work out what a post is about and how a member's professional interests change.
LinkedIn's older engineering post on dwell time describes a model that lowers an update's score in proportion to the predicted chance a member skips it. Use it as history, not as a description of the current feed.
Read the LinkedIn algorithm guide for the formats, profile and comment decisions that follow from that feed.
The decision for each feed
| Platform | Decision |
|---|---|
| Plan Feed and Reels separately, and read the launch warning before any setup step. | |
| Earn replies from people who read the post. Do not rely on pods or comment automation, because LinkedIn works against both. | |
| TikTok | Set formats and hooks with the TikTok playbook, then test each one on your own watch-time data. |
What Changed on Social Platforms in 2026
Read each change as a question for your own analytics, not as an instruction to change your plan yet.
LinkedIn's March 12, 2026 newsroom post says it is working to make engagement pods ineffective, curb comment automation, and reduce recycled and click-driven posts.
LinkedIn also names engagement bait to avoid, such as comment to agree prompts and videos that do not match the post text. It says the changes are not about limiting reach or discouraging participation, and it gives no figures.
LinkedIn is also testing an Interest Picker during sign-up for new members.
TikTok says its US joint venture, TikTok USDS Joint Venture LLC, is established in compliance with US regulatory requirements.
The Register reports that Oracle, Silver Lake and MGX hold 15% each, and that ByteDance owns 19.9%.
Social Media Benchmarks and How to Read Them
Check the base before you compare any two engagement rates. A rate per follower and a rate per impression measure different things, and an average does not match a median.
Socialinsider's 2026 benchmark report uses 2025 data. It gives average TikTok engagement by followers of 2.50% in 2024 and 3.70% in 2025.
The study's dataset has 40,695,768 posts from brands with roughly 1K to 1M followers, and it counts organic posts only.
For Instagram, the same study divides likes and comments by followers. Its figure moved from 0.50% to 0.48%, across 75,589,902 posts. Facebook held at 0.15% across 71,856,511 posts.
Read these as averages across all posts. A few very high-performing accounts can move an average, so compare your own average with the study's average, not with its top accounts.
The Socialinsider page reports no LinkedIn rate.
Use one base for every platform before you compare them. Quote the exact figure from the vendor report and name the year it covers.
AuthoredUp, a LinkedIn tool vendor, reports average reach down 34% in 2025, using a dataset of over 621,833 posts.
Treat that figure as a vendor's view of the market, not as your account's trend. Set your LinkedIn reach target from your own history.
The LinkedIn algorithm guide covers reach by format in depth, so use it before you change your content mix.
Before you compare two numbers, check
- The base: per follower, per impression, or per post.
- The statistic: average or median.
- The year, and the sample size in posts and accounts.
- The account size: a benchmark from one follower band may not match yours.
- The source type: a tool vendor's data or a platform's own statement.
Every Social Media Guide on GrowthVector
| Page | What it answers |
|---|---|
| Social Media Marketing Guide: TikTok, Instagram and LinkedIn | Social media marketing guide: which platform fits your audience, how each feed decides reach, what changed in 2026, and how to read engagement benchmarks. |
| TikTok Growth Strategy: Setup, Hooks and Content Formats | TikTok growth strategy: account setup and warm-up, multi-account setups, content formats, hook writing and testing, trends, and creator sourcing. |
| Instagram Growth: The 4-Phase Launch Protocol | Grow a new Instagram account with a 4-phase launch protocol: device checks, warm-up, a safe-zone launch, and the 10-video test, plus a quick reference. |
| LinkedIn Algorithm 2026: How the Feed Ranks Your Posts | How the LinkedIn algorithm ranks posts in 2026: reach trends, which formats win, profile and company page setup, comments, cadence, hooks and newsletters. |
Common Questions
Why do engagement rates from different vendors fail to match?
Vendors use different bases, so compare the base before the number. Socialinsider divides Instagram likes and comments by followers, and its Instagram figure is 0.48% for 2025, against 0.50% in the earlier period. Its TikTok average by followers is 3.70% for 2025. The Socialinsider page has no LinkedIn rate, and a rate per impression cannot be compared with a rate per follower. Its figures are averages across all posts, so check the statistic and the year before you set a target.
Does a Pew usage share tell me whether my buyers are on a platform?
No. Pew asks whether US adults say they ever use each platform. That measures reach, not whether your buyers are present or how long they spend there. In Pew's 2025 survey, 50% of US adults say they use Instagram, 37% use TikTok, and 24% use TikTok daily. Pair any adult share with your own audience data before you choose a platform.
Does LinkedIn's 2026 feed change penalize engagement pods and comment automation?
LinkedIn says it is working to make engagement pods ineffective and to curb comment automation. It also names engagement bait to avoid, such as comment to agree prompts and videos that do not match the post text. LinkedIn says the changes are not about limiting reach, and it gives no figures for the effect. Test the claim on your own posts before you change your posting cadence or your comment routine.
Is there one Instagram algorithm to optimize for?
No. Instagram says it has no single algorithm, and each surface ranks content differently. For Feed, its listed inputs include your activity, information about the post and your history of interacting with the poster. For Reels, the inputs include information about the reel. Meta's Reels page lists viewing time and views with sound on as example inputs, and says they change frequently. Plan each surface on its own, and recheck the plan when your reach shifts.
Did TikTok's US ownership change alter the For You feed?
TikTok says its US joint venture, TikTok USDS Joint Venture LLC, is established. The Register reports that the venture plans to retrain, test and update the content recommendation algorithm on U.S. user data, so treat any timing as unconfirmed. Judge any shift in For You reach on your own data from the weeks before and after it, and treat creator reports as leads to test, not as proof of a change.
Is a 34% drop in average LinkedIn reach a reason to stop posting?
Not on its own. AuthoredUp, a LinkedIn tool vendor, reports average reach down 34% in 2025, using a dataset of over 621,833 posts. A vendor sample may not match your audience, and an average can move a lot when a few posts change. Compare your own reach for the same months before and after a change. Then use the LinkedIn playbook to decide which formats to keep.
Next step
If your buyers are professionals, open the LinkedIn algorithm guide first. If you plan short video, read the location warning on the TikTok growth strategy page before you set up any account.