What do you do for checking what is uploaded? Do you use a service like Amazon Mechanical Turk and have people go over the content or do you use something like

What do you do for checking what is uploaded? Do you use a service like Amazon Mechanical Turk and have people go over the content or do you use something like computer vision? Exit node ip, that's the last ip-address right? There was something in PHP I did recently that did that, gave you the last ip. Maybe I'm mistaken.