May 19, 2011 By Albert Sun, Jennifer Valentino-DeVries and Zach Seward Home | Gender Breakdown | Top Venues | Digits Blog Post We collected every check-in on location-sharing service Foursquare for a week starting at noon Eastern on Friday, Jan. 21 until noon on Friday Jan. 28. Foursquare, which provided the data, removed all material that could identify an individual user.