Here at Battenhall we review the world's top social media and social messaging apps every month, and we publish this data in our publication the Battenhall Monthly. We thought we would do a special end of year review, with Instagram having just hit 300 million users, overtaking Twitter in the process, this is the most up to date chart we think you'll find.

It's a way before any social network catches up with Facebook, but we predict WhatsApp and WeChat will be the growth stories of 2015.