"Badoo is a multi-lingual, London based, social networking website....
Unlike other social networking services, Badoo does not incorporate advertising in any part of the site, thus a user's profile contains only user-generated content. It generates income through a "Rise Up" feature which allows users to pay to have their profile given more prominence on the site for a limited time. 20% of Badoo's 12.5 million users access this function once a month."
We find that to be an intriguing business model, which, it would seem to us, could also be used to sell goods and services online. We joined Badoo to try it out, but it seems to be very much directed at a much younger audience than yours truly.