I am running PS 1.7.6.5 and I had the same problem.
The problem got solved after I had updated the module ps_accounts to the version 3.3.5
You can download the module from here:
https://support.prestashop.com/attachments/token/gJ6ARzqxyKQt2in2KeyDtOIOm/?name=ps_accounts.zip
or from the attachment in this post.
After installing this update I was able to install and configure the Facebook module.
BR
ps_accounts.zip