Facebook

hello I had the facebook login working fine but it wouldnt work earlier so I tried creating new details.

Now I can't edit a profile because it says There is an error retrieving your Facebook details. Facebook returns an error message of: "(#12) username is deprecated for versions v2.0 and higher" but i cant get in to change the social intergration within the profile & cant see what to do in admin either.

Is there a way to switch off the intergaration of facebook with a users profile in the back end, i need to delete the record so can test to see if the new facebook app is working as it was before.

thanks