Tagged.com

Tagged is a social discovery website based in San Francisco, California, founded in 2004. It allows members to browse the profiles of any other members, and share tags and virtual gifts. Tagged claims it has 300 million members. As of September 2011, Quantcast estimates Tagged monthly unique users at 5.9 million in the United States, and 18.6 million globally.  Michael Arrington wrote in April 2011 that Tagged is most notable for the ability to grow profitably during the era of Facebook.