"Doing this will ensure that only you and your friends
can see the address on the venue page; everyone else sees a zoomed out map with no map pin (rather than the real location)," a Foursquare support entry explains. "If a Mayorship, badge unlock or
check-in is shared to Twitter or Facebook, the venue URL will include a map without a specific location for everyone."
Foursquare users can also flag venues as their home or have it removed, even if they didn't create it, according to Foursquare's support site. "Go to the venue page on the website and click "Report a Problem" for a list of flagging options, Mashable adds.