Facebook may not turn out to be so much of a Foursquare killer.

In fact, the world’s largest social network drives the largest share of the location-based game’s web traffic, accounting for 33 percent of all upstream visits last week, according to web research firm Hitwise. Google follows closely behind, with a 22 percent share, and then Twitter clocks in at 8 percent.

Foursquare, the location game from Dodgeball creator Dennis Crowley, has been on a tear as of late, breaking past 500,000 registered users and logging 275,000 check-ins yesterday alone.

Although some blogs have speculated that Facebook’s forthcoming location features may spell the end for smaller startups, we hear that the social network is inclined to serve as a platform for a whole host of location-related applications.