Twitter has started rolling out the view count for tweets, a feature that shows how many people have viewed a particular tweet. In the app, users can now see view counters alongside the number of comments, retweets, and likes. However, not every tweet will have a visible view count, according to a Twitter FAQ. Exceptions include Community tweets, Twitter Circle tweets, and "older" tweets because the data for them isn't available. As for what counts as a view, it seems like basically any time your tweet shows up on someone's screen, even if it's your own, as per The Verge. Further, viewing a tweet from the web and then looking at it on the phone would count as two separate views. Also, these views will be visible to everyone, not just the owner of the account.