NPR MARKETPLACE - Feb 10 - Social networks got popular and we got much more comfortable sharing our personal lives online so much that entrepreneurs are now latching onto our social networks to create social dating sites like Badoo.com. Broadcasting your private life is key to Badoo’s success. Sites like eHarmony spend millions of dollars on advertising to attract new users. Badoo doesn’t have to. Its users spread the word. Mark Brooks, a consultant to the online dating industry: "Yes they’re not paying so much to acquire users. In fact in many cases they’re not paying anything". The company says it’s on track to take in $150M a year.