"10 Million"

The location-based social networking service says it has more than 10 million members.

By sharing that number, as well as related maps and figures, Foursquare is trying to show that it's becoming a service with mass appeal...

But Foursquare's news doesn't really address the biggest criticism heard about the service, that most people will quickly tire of check ins that serve very little purpose...

The real question, then, isn't how many people have signed up for Foursquare, but how many are still active in a given month. And a Foursquare spokesperson declined to provide that number.

And if Foursquare does have a healthy amount of active members, it still faces another big question: How is it actually going to make money?

2 months ago: ...looking to raise a reported $20 million to $40 million for its next investment round, based on the idea that the company, which has 8 million users, is worth as much as $500 million. The problem? Foursquare has yet to demonstrate a successful revenue model—or even show that its principals care much about coming up with one that can justify that kind of valuation.

7 months ago: "That Growth Phase"