Perhaps I'm not as deeply into FaceBook as others, but I haven't seen any hint of pornography, criminal activities, fraud, paedophilia and advertisements on gambling and alcohol anywhere on FaceBook. I'm not sure of the need for this site, except to separate one group from another to increase "diversity" aka divisiveness.
If parents encourage their muslim kids to join this separate but equal site, they are less likely to murder their kids in honor killings for bringing shame upon the family by dating a kufir.