There's not really a shortcut around having employees do it because Facebook has a significant amount of private content which users will not tolerate being shared, standards vary widely (imagine a vegan flagging every picture with leather visible or a post about eating meat as obscene — if you're requiring this, do you just disable their account once you notice it?), and especially because it's the target of coordinated group activity so errors won't be uncorrelated: get a cycle of outrage politics going and you'll have thousands of people around the world who have no easily-observed connection to each other flagging things as either objectionable or safe.