Linking a user profile in JR site to the user's profile in another social network...how exactly?
Using Jamroom
question is not clear. It sounds like you're looking for a way to allow your current users to let other users know of their presence on other social networks.
If that's correct then one way to do it would be to add some custom fields to their ACCOUNT SETTINGS -> PROFILE form to allow them to input what their other locations are then display those on their profile so the other users can click on it to reach them in the other locations.