In rare cases it can happen that you cannot link your Facebook account.
The following tips or information may help:
Java must be enabled
Delete your cookies, your cache
Restart your browser
Try another browser to connect (We recommend Google Chrome )
Restart your computer
Check the security settings in your Facebook account
If necessary, delete the fanSlave application in your Facebook account and then try the connection again
The Update button does not work if you're using the option 'use Facebook as a page'
Try to connect your account from another computer