I'm in the Wrong Business, Part 907: "How Badoo built a billion-pound social network... on sex"

I owe someone a hat tip on this but can't for the life of me recall who sent it. Drop us a line and we'll link, in your name, to the charity of your choice.
(don't you just hate that kind of gift?)
From Wired:

It's a 120-million-member social network that's adding over 300,000 users a day, with more than 4.3 million daily photo and video uploads, and seven billion monthly page views. It has Facebook's fastest-growing app, with 570,000 new daily users, making it the third-biggest app of all after FarmVille and CityVille. Hugely profitable, it's forecast to generate hundreds of millions of dollars this year, and is being aggressively courted by venture-capital firms valuing it in the billions. And it's run from London by a secretive Russian serial entrepreneur who has steadfastly refused to be interviewed or photographed. Until now....MORE