Facebook Token expired

On Facebook the "token" may expire in three ways:

   - Time: generally after 60 days from the last access the token gets deactivated.
   - Change password: the token is linked to the old password, if you change it is necessary to log in again with the new password.
   - Other problems: We can turn off your token if this is causing problems to the site.

To reauthorize Facebook just login to your site, click on Social Networks and re-connect the expired social.