Not entirely sure about this.
Today, Twitter has launched a public test of a new ‘Views’ count on some users’ tweets, which displays the total number of times that each of your tweets was seen in the app.
As you can see in this example, posted by @chimponsey, in the expanded tweet activity display, some users are now also seeing a ‘Views’ listing, alongside ‘Retweets’ and ‘Likes’.
The count is also indicated by an eye icon in the main tweet stream.