Where there are lots of users online, there are also lots of inactive users too. Here's a run-down of inactive users on two of today's most popular social sites.
- Instagram has 2.2 million registered users. 37.5% of registered users have never uploaded a photo. 65% follow nobody. (source)
- Twitter has 175 million registered users. There are 56 million Twitter accounts following zero other accounts, and 90 million Twitter accounts with zero followers. (source)
- 21% of Twitter users have never posted an update (source)