LinkedIn now has 400M users, but only 25% of them use it monthly

If you go on the cumulative figures alone, LinkedIn appears markedly larger than Twitter; but that’s not a fair comparison. Twitter, Facebook, and plenty of other social networks consistently rely on “monthly active user” numbers (MAUs) instead — stats which LinkedIn buries below its better-looking cumulative figures.

 http://venturebeat.com/2015/10/29/linkedin-now-has-400m-users-but-only-25-of-them-use-it-monthly/