"As Foursquare powers Instagram and I'm sure that a LOT of people are geotagging their photos then they'll probably argue that there are more active users than actual accounts. If Facebook can argue that someone who clicks a like button but never visits the Facebook site is active and Google can argue that someone who uses a Plus enabled service without visiting the Plus homepage is active they why can't Foursquare. The location game has changed and they are probably better off pivoting." - Colin Walker