They should filter all inappropriate pictures.
One reason I don't use or trust this site. They should not allow those pictures. Facebook pages even have users who own Adult websites, and hateful content!
Just don't let children surf this site without your supervision.
It is way too difficult to delete your profile, and your content can still be "live" afterwards. Applications are not vetted enough, there is way too much they can get access to, and they can spam you and your friends. Notifications are Opt Out, so everytime one of your friends does something with a new app, you get notified until you turn that off for only that one application.
There is some genuinely good functions on this site, and it will probably stay popular for a long time. My advice would be to either severely limit your info and content on there, and do not put your contact details on there unless you restirct them a lot.... the amount of people that list everything is insane...
they don't delete uploaded photos from there servers have studies have shown you can still access them from the direct link. It's good for keeping in contact with people but don't put too much information as privacy can easily be ignored.