Fresh off celebrating 10 million members, Foursquare is now commemorating a new achievement — more than 500,000 merchant accounts.
The startup made the announcement in a blog post Wednesday, highlighting several creative brands who are currently using Foursquare for marketing purposes.
2011 is proving to be a big year for the two year-old Foursquare; it recently raised another $50 million in funding and just announced a nationwide partnership with American Express.