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How hashtags and keywords actually work

Twenty-five in-depth articles on what genuinely drives discovery across Instagram, TikTok, YouTube, LinkedIn, Pinterest, Reddit and the rest — including the parts most hashtag advice gets wrong.

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ReferenceHow many hashtags to use on each platform, and why the numbers differA per-platform reference across eleven platforms, with the reasoning behind each number — from zero to fifteen.8 min read FrameworkThe broad, medium, niche framework: how to build a hashtag set that reaches anyoneA three-tier model based on competition rather than popularity, and how the mix should change as an account grows.7 min read FundamentalsHashtags and keywords are not the same thing, and mixing them up costs youHashtags classify content; keywords match queries. Why the same phrase works as one and fails as the other.6 min read FundamentalsHow recommendation algorithms actually decide what to showThe shared logic behind every major platform — the testing phase, the signals that count, and what follows from it.7 min read

By platform

Instagram strategyWhy Instagram now favours five niche hashtags over thirty broad onesInstagram’s ranking shifted from hashtag volume to topical relevance. What changed, and how to build a five-tag set that reaches people.7 min read TikTok strategyTikTok caps you at five hashtags. Here is how to spend them.With a hard cap of five, each slot has an opportunity cost — and most creators waste two on tags that do nothing.6 min read YouTube strategyWhat YouTube tags actually do (and the four fields that matter more)YouTube has downplayed tags for years, yet the field still exists. What it genuinely contributes, and where to spend effort instead.7 min read YouTube strategyWriting YouTube titles that rank in search and still get clickedA title has to satisfy a search algorithm and a human deciding in half a second. The structures that do both.7 min read LinkedIn strategyLinkedIn is a keyword platform pretending to be a hashtag platformThree hashtags is the working maximum — but the keywords in your post body and profile do far more work.6 min read Pinterest strategyPinterest is a search engine, and that changes everything about your tagsPins have a shelf life of months and users arrive by searching. Almost every rule from Instagram gets inverted.6 min read Reddit strategyReddit has no hashtags. Here is what replaces them.Discovery on Reddit runs on subreddit choice, title wording, and community norms. How to be found without looking like a marketer.6 min read Short-formShorts, Reels and TikTok are not the same productThe three differ in audience intent and discovery mechanics enough that identical uploads underperform on two of them.7 min read

Craft and tactics

CraftWriting captions that earn engagement instead of scrolling pastA caption has about one line to earn the expansion. The patterns that work, and what to do with the rest.7 min read CraftAlt text is the most neglected field on your postIt serves screen readers and gives platforms a clear description of your image. How to write it, and why auto-generated alt text is inadequate.5 min read TacticsThe first-comment question: does putting hashtags there actually help?Widely recommended, thinly supported. What the practice actually achieves, and better uses for that comment.5 min read TacticsTrend timing: how to tell whether a trend is worth joiningTrends have a shorter usable window than most people think. How to judge the stage, and when joining costs more than skipping.6 min read

Growth and workflow

GrowthPosting frequency: why more is not better past a certain pointFrequency helps until it cannibalises quality and attention. Where that line sits, and how to find your own rate.6 min read GrowthHashtag strategy when you have under 1,000 followersSmall accounts need the opposite of standard advice. Why big tags are mathematically hopeless below a certain size.7 min read WorkflowRepurposing content properly: what to change and what to keepOne idea can legitimately become five posts. The parts that must change per platform, and the version that fails.7 min read WorkflowBuild a content system, not a posting streakStreaks break and take momentum with them. Idea capture, batching, a buffer, and a review loop survive a bad week.6 min read

Fixing and measuring

DiagnosticsSeven hashtag mistakes that quietly cost you reachThe errors that do real damage — identical blocks, engagement bait, trend-jacking — and how to spot which affects you.7 min read DiagnosticsWhy copying a bigger account’s hashtags does not workTheir tag set is calibrated to their audience size. What to take from competitor research instead.6 min read RiskBanned and restricted hashtags: how ordinary words get your post limitedSome tags quietly limit reach for any post using them, and many look harmless. How to check one in thirty seconds.6 min read MeasurementWhich metrics actually matter, and which ones are noiseMost creators watch the metrics that move most and mean least. A ranking by how much each one tells you.7 min read MeasurementHow to actually test whether your hashtags are workingWhich metric to use, why you need five posts per variant, and the confounds that make most creator testing meaningless.7 min read

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