Tumblr’s former popularity metric was called Tumblarity.
Tumblarity was an early Tumblr scoring system intended to summarize a blog’s activity and popularity across the network. It drew on signals such as posting activity and audience interaction, giving users a numerical way to compare how much attention their blogs were receiving.
Tumblr introduced the metric alongside an Activity page, where users could view information about their blog’s performance. The system was short-lived and was eventually retired, making it a piece of Tumblr history rather than a current analytics feature. Modern Tumblr emphasizes posts, notes, reblogs, tags, and follower activity instead of one universal popularity score.
A common mix-up is treating Tumblarity as simply a follower count or post count. Those numbers helped reflect a blog’s activity, but Tumblarity itself was an aggregate score. It also differed from “notes,” which count interactions attached to an individual post, including likes and reblogs.