Hot on the heels of Photocheck.in , a service we covered a few days ago that allows you to check-in on Foursquare simply by sending a picture , comes news that TweetPhoto is creating a platform for picture integration with Foursquare . Using TweetPhoto's new API, any third-party Foursquare developer can add picture functionality to their site or app. Whereas Photocheck.in is a stand-alone service that allows you to check-in via picture, this new TweetPhoto API is aiming for developers who create apps that use both Twitter and Foursquare. Because Foursquare does not allow for pictures to be placed on its site or in its check-in stream, the idea here is to leverage Twitter (which Photocheck.in can also do) to send these pictures out after their location information is filtered through a Foursquare check-in. The advantage to this is that developers will be able to query photos by Foursquare venue name. As you might imagine, this might be a cool little feature in a third-party location app.