Tagged, which claims to have 10 million active users for its social network that’s aimed at meeting new people rather than connecting with existing friends, announced it was acquiring another social network, hi5. Tagged says most of its members are outside the U.S., and hi5 will double its active user base. Hi5 has been re-positioning itself as a social gaming site for some time, and Tagged uses games as one of its vehicles to connect strangers. I think there’s a role for niche social networks, and geography and activity are two potential differentiators. But these days, isn’t it easier to lay those kinds of frameworks atop an existing platform like Facebook and Twiiter? Or try to harness Google+? If seems the only serious near-term threat to Facebook is lack of interest, rather than specialization. But we’ll keep watching.