This piece from LifeSite News largely speaks for itself:
Faithful Catholics and anyone else who professes belief in Jesus Christ should get off of Facebook and delete their accounts forever. There is no excuse for continuing to feed this evil Leviathan. If you are on Facebook you are part of their product, not one of their customers. The advertisers who make money from your personal information are their customers.
There is no excuse for any faithful follower of Christ to continue serving the interests of these despicable people. Please stop.
Laudamus te, Domine Jesu Christe!