Roku Support
posted this on July 29, 2011 14:42
To add an additional Facebook account to Facebook Photos & Video, select Settings from the main screen of the channel. Select the user name then select Add user. Follow the instructions on the linking screen to link to another account.
Once you complete linking, Facebook Photos & Video will automatically sign in to the account of the just-added user. To switch back to another user, select Settings from the main screen of the channel. Select the user name then select the name of the user account you wish to which you wish to switch.