(FORTUNE Small Business) - The problem with multiplayer online videogames is that you inevitably get fragged by some obnoxious 14-year-old. Xfire helps fed-up gamers find their friends online and play with them. Mike Cassidy - a 43-year-old serial entrepreneur - and Dennis Fong, 29, created the Menlo Park, Calif., company in 2003. Today Xfire boasts one million active users, each of whom spends an average 91 hours a month using the service.

In April, Viacom - wanting its MTV Networks group to tap into that rabid audience - paid $102 million for Xfire, which made less than $10 million in advertising revenue last year. Jeff Kinderman, of Tucson's Oracle Capital Advisors, says the price is rich but fair: "This is not about profits but about capturing market space." Cassidy and Fong, who will stay with Xfire, agree. The deal "gives us almost unlimited resources," Fong says.