Vine on Wednesday put out a tweet noting that its video sharing app now boasts over 40 million users, which is an impressive accomplishment considering that the app is just eight months old. Even more impressive is that Vine, once it became available on Android in June of this year, grew from 13 million users to now over 40 million. Recall that Vine, from January through June, was only available for iOS users.
Not everyone, though, is blown away. It is important to ascertain what percentage of an app's total user base are actually using it.
