how to link foursquare to facebook on android

If you mistaking link someone to the wrong facebook account you can just go to the contact then click the little link icon at the top next to the person's name. Where it has "Linked Contracts" you can just click the link icon again and it will break the link and remove the link between your contact and facebook.

Also when when you link an account the phone automatically pull the facebook picture as your contact image. If you click on the picture you can change it from Facebook, phone, camera, gmail, or photo. This is good if you don't like the picture the person has on their facebook.

From the People (contacts) if you click on hold on the person's picture you get a option to call them, send a text, or lookup their address on google maps.