Facebook gets funding offer from Russian private equity firm

The debate over the value of social networks will go on for months and perhaps longer. Operations like Google's (GOOG) YouTube, News Corp.'s (NWS) MySpace, Twitter, and Facebook have huge numbers of users. Facebook now has over 200 million users world wide.

But the websites have done poorly finding revenue models. Industry experts say that Facebook will bring in only $500 million in revenue this year and will probably lose money. That sales figure is remarkably low for a business with such a large audience.