In the main most people are on facebook and twitter. Alot signed up to google+ probably more through hype than need how many of your friends or colleagues use google+ on a regular basis for interaction? Vic Gundotra Senior VP at Google indicated in a blog post in April 2012 that 170 million had upgraded to the new version.

In the uk most peoples introduction to soicial was probably friends reunited.

There are a myriad of others see social media for a list

I am quite shocked at the number that are out there, I am sure this list will grow; for the number of registered users it would be interesting to know how many of them are regularly active, though what is the definition of regularly active is it daily, weekly or longer.

There now appears to be a social group for different interests and various geographical based regions.

Facebook undoubtably has the largest online share but its precence is not the largest in the likes of China, Russia and Japan.

The two big player in China appear to be Sina Weibo (known as the chinese facebook) and Renren (twitter equivalent). Facebook apparently is locked by the “great firewall of china”. It may be too late for facebook to break into this market even if it was allowed to operate in china and operated using the censorship restrictions that china appears to enforce.