GLOSSARY · LINKEDIN MECHANICS
Impressions vs reach
Impressions and reach are two different counts of a post's exposure. Impressions count the number of times a post was displayed on screen, so one person who sees the post three times generates three impressions. Reach counts unique members who saw it, so that same person counts once. LinkedIn's post analytics report impressions and, for some accounts, a separate members-reached figure. Impressions are always equal to or higher than reach. Neither measures whether anyone read the post, and both are weak proxies for commercial outcomes, but knowing the difference prevents the common error of reading impressions as people.
How it works in practice
When LinkedIn shows a post in someone's feed, that display is an impression. The feed can show the same post to the same member more than once, for instance when a connection comments on it a day later and it reappears. Reach removes those repeats and counts members. The gap between the two tells you something: a post with impressions far above reach was shown repeatedly to the same people, usually because of ongoing comment activity, while a post where the two numbers are close spread once and stopped. For personal branding, the number that matters more than either is who was reached. LinkedIn's analytics break down viewers by job title, company and location for posts and for the profile.
A post with modest reach made up of heads of operations at mid-size firms is worth more to a company selling to them than a post with ten times the reach that went to students and job seekers. Treat impressions as a sanity check, reach as a slightly better one, and audience composition as the real reading. Then connect it to actions: profile views, follows, inbound messages and meetings. A post that produced two conversations with buyers beat the viral post that produced none, whatever the impression count says.
Example
A post shows 12,000 impressions and 7,500 members reached. The viewer breakdown shows most were founders at companies with fewer than 50 staff, which is exactly the buyer. That is a better result than a 40,000-impression post that reached mostly recruiters.
Common mistake
Reporting impressions as if they were readers, then setting targets on them. Teams end up writing for volume, and the audience that actually buys gets diluted by one that never will.