There are a few FB groups. Here's one I belong to
https://www.facebook.com/groups/extfichristians/

Are there anymore? I used to be one in my old fb with more members but I lost the link...

I'm also looking fo facebook groups/pages, if anyone has some links to share.

Found these two facebook groups

https://www.facebook.com/groups/extfidiscussion/?notif_t=group_r2j_approved&notif_id=1464691086489917
https://www.facebook.com/groups/nonreligiousextfi/?ref=ts&fref=ts

There are others but that seem more pro TFI than anything else... you can find them by searching "ex-tfi members"