checkout
http://www.lamebook.com
Facebook are trying to sue them as their sitename is close to facebook AND they post all the funnies from facebook. OK so they are screenshots and I don't think facebook can stop that BUT depending on your success, make enough noise, if you DO get noticed then they MAY take offence!
Highly unlikely but do be careful! Your work where you are trying to do something nice is highlighting the dangers in facebook and using them as an example of a place to be careful. Myspace and bebo are of course others...
Again, unlikely anything will hapen but in this world, strange things that seem impossibly ludicrous can happen!