Since its launch in August, Facebook Places has been used by 30 million Facebook users. But taking Facebook's 500 million users into account means that only 16 percent of users have used the Places feature. But this number is still much larger than Foursquare's 4 million users — although analysts agree that Foursquare shouldn't be worried. Find out why after the break.

The two services, while similar, have different levels of reach. Foursquare, which started in only a handful of cities across the US, has a devoted user base, actively seeking badges and mayorships and taking advantage of special advertiser promotions and deals while using the service. Facebook's equivalent doesn't have badges, mayorships, or any kind of rewards program for check-ins (yet).

I'm a devoted Foursquare user but have used Facebook Places (maybe) twice, and I don't see that changing any time soon. What about you? Have you checked in on Facebook Places? Foursquare? Both? Neither?