brotherhood_of_LAN - 3:28 pm on Oct 4, 2012 (gmt 0)
It works out to about 25% share in each of Europe, North America and Asia, with the remaining 25% for the rest of the world.
The BBC mentions Mr Z visiting Russia in face of competition from more local social networks.
"The competition in this region comes from the likes of VKontakte, which is far in the lead with an estimated userbase of almost 300 million. [bbc.co.uk...] "
Which made me smile, as Russia's population is 140M so I can only assume the site is popular outside Russia too.
Fake profiles aside, it's still undeniable that hundreds of millions of people use Facebook and fake accounts can surely not count for more than a quarter of the total.