Currently Online 
| spemanig said: Steam has 65m+ users "around the world" and its digital only. |
Just a tiny correction: Steam had 65m+ users "around the world" in October 2013.
They had an impressive growth rate since then: 75m+ in January 2014, 100m+ users in September 2014, 125m+ users in February 2015, probably 150m+ users today. And these are all active accounts, Valve doesn't track "dead accounts" where you activated a game years before and never played it again.
Apple's "Game Center" (which ain't automatically activated for iOS-users who don't play games) also had an enormous groth rate: 65m+ users in September 2011, 130m+ users in June 2012, 240m+ in June 2013, probably 400m+ users now.
http://www.asymco.com/2012/08/07/measuring-ios-as-a-gaming-platform/ , http://www.asymco.com/2013/08/05/itunes-update/
