It looks like Zuckerberg and Co. may be looking to make a big push for Facebook Places, and an on-going trial indicates that it could start with Instagram. The folks in Menlo Park are testing the social networks' own service for adding location info, but for now, Foursquare remains an option for sharing inside its popular filter-driven photo editor. In fact, some users have already encountered the tweak. Instagram has long used Foursquare's API and venue data for attaching snapshots to a particular place, and there's no guarantee that the trials will even make it to a new version of the app. Of course, in addition to Foursquare, users can beam photos to Twitter, Tumblr and Flickr in addition to the parent social network. We reached out for a comment on the matter and we recieved the following statement from an Instagram spokesperson:

Foursquare is a great partner, and people will continue to be able to share their check-ins to Foursquare from Instagram. We are constantly testing experiences throughout the app to provide the best possible user experience as part of future planning.