What are you talking about. There are shit-tons of people where I use it on the east coast. When I'm in the fly-over states it's not all that great for speed trap reporting because there's just not the saturation, but it seems to be spreading quite nicely in bigger cities there too.

Although, I do have to say it feels like there are less users now than before some of the recent updates that seem to have really kind of messed with the mapping and routing.

Facebook operates worldwide not just in the US.