that must be so hard. i sound like your daughter :P. i mean, i guess ive been your daughter for the last 2 years. only my place that i spent till 2 am on till (or sometimes 6 am) was here. and even here has had its fair share of perverts. its important that you try to keep on top of this stuff and it looks like your doing a good job of it. keep up the good work hon, i think your doing teh right thing. i certainly wouldnt want my kid surfing the net so late and meeting with some of the people ive known. i personally have myspace facebook and bebo. but my bebo page is only viewable by my schoolfriends and a few teens from this site, and has no info about me and doesnt have a pic of me. same goes for the other two. i dont use them that much either. at 12 i think the internet is VERY dangerous. and i can uunderstand your worries. id personally say most teens were too young to be online nowadays let alone preteens.
idk but i think now would be a good idea to educate her a little on the idea of perverts on teh net. because from my personal experiences, they screw you up just as much as those in real life. and i have physical as well as mental evidence for that fact.

good luck hon. hope i havent been too assuming or anything.