Thank you for contacting us.
It seems that you're using outdated facebook application, that contain deprecated permissions set.
Try to create new FB app and use it with your site (create new keys for JomSocial).
1. Edit your first post.
2. Click switch below main text field: prntscr.com/fk3hdg
3. Provide your site details: backend URL, admin credentials and FTP: prntscr.com/fk3hwz
4. Let us know that you provided credentials by posting in the same thread.
I'll by happy to investigate this issue on your site, just need access to it.
I was able to replicate that issue on your site.
It's due to server 500 error: prnt.sc/hc839f
Please, try to switch to Joomla! default template Protostar and check if issue also appers.
Additional check your server error log and post here latest entries.
I'll assign developer to further investigate this issue.
He'll contact you ASAP.
The main problem is that you still using JomSocial 220.127.116.11 that is very very old and unsupported.
That version uses outdated FB library.
Since that version FB changed their API so the only option is to upgrade to latest JomSocial 4.5.