How the X Algorithm Decides Who Sees Your Post

2026-08-29 · 8 min read

X is unusual among the big platforms in that a version of its ranking algorithm has been published. You do not have to reverse-engineer it from anecdotes the way you do with Instagram. The broad shape is known, and it is more lopsided than most people assume.

The headline finding, and the one that changes how you post: replies are worth many times more than likes, and a reply you respond to is worth more again. Everything else follows from that.

The rough weighting

Each candidate post is scored for each user, and the score is dominated by predicted engagement, weighted by type. In descending order of value:

• A reply that the author then responds to, which is the single strongest positive signal in the system
• A reply on its own
• A repost, which carries the post to a new audience and is treated as a strong endorsement
• Profile clicks followed by any engagement, which reads as a viewer deciding you are worth investigating
• Extended dwell, meaning the post held the screen well beyond a scroll
• A like, which is cheap and weighted accordingly

And on the negative side, one signal outweighs the rest by a very large margin: a report or a block. A small number of those does more damage than a large number of likes repairs.

Why external links cost you

Posts containing an external link are consistently distributed less than posts without one. As on Facebook, this is not moral disapproval — a link sends the user off the platform, which is the outcome the ranking model is trained to avoid.

The workaround everybody uses is putting the link in a reply to your own post. It genuinely helps, and it has a real cost: the reply is seen by a fraction of the people who see the parent post. Use it when reach matters more than clicks, and accept the reach hit when the click is the point.

The first thirty minutes

X tests a new post against a small slice of your followers and a smaller slice of non-followers who have engaged with similar content. Nothing you do after roughly the first half hour changes the trajectory much.

The practical consequence is that a post ending in a genuine, answerable question outperforms an identical post that just states the conclusion, because it converts passive readers into repliers inside the window that matters. The question has to be real — a rhetorical one gets ignored and the post is judged on likes alone.

Impressions are not reach

X shows an impression count on every post, and it is the most misread number on the platform. An impression is the post appearing on a screen. It does not mean read, it does not deduplicate the way you would expect across sessions, and a large number of impressions with near-zero engagement is a signal of a post that was widely shown and universally ignored.

The number worth watching is the engagement rate against impressions. Under about 1 percent, the post reached people it should not have reached, which usually means the opening line promised something the post did not deliver.

Where followers and likes fit

Follower count on X does two things. It sets the size of the initial test audience, which is a genuine mechanical advantage, and it decides whether a stranger reading one good post clicks through and stays.

That second effect is why people buy twitter followers, and it is the honest version of the case. An account with 60 followers writing genuinely good posts gets read as somebody talking to themselves; the same posts at 6,000 get read as somebody worth following. It is social proof and it works the way social proof works everywhere.

It does not make your posts better and it does not change the weighting above. An account with a large follower count and posts sitting at eleven impressions is a visible contradiction, and on X specifically the audience is unusually good at spotting it — the follower-to-engagement ratio is public on every single post.

The one thing that beats all of this

Replying to other people's posts, in the accounts' own threads, early. A good reply on a large account's post is shown to that account's audience, costs nothing, and is the only reliable way a small account reaches strangers on X. It is also the mechanism the algorithm rewards most heavily, which is a rare case of the incentive and the useful behaviour pointing the same way.