This is a common question! Sometimes people have multiple Rally pages and may have accidentally linked their Facebook or Twitter account to the wrong Rally profile. You can unlink Facebook or Twitter from the User Home of your Rally. Your User Home contains all of your Rally cause's activity. You can get there by navigating to your user profile in the upper right-hand corner of your screen and choosing User Home from the drop-down menu options.
You will see the option to link or unlink your Facebook on the left side of your User Home choices. You will be asked to confirm your action when you unlink your Facebook or Twitter from Rally.