Why did your son do it? You'd have to ask him.
I don't know of an easy way to recover that info, but a look at the .dat files in that directory may be of some help. I'd post over in the Internet forums for more advice on this: http://www.bleepingcomputer.com/forums/f/14/web-browsingemail-and-other-internet-applications/
You may also be able to get some assistance in preventing/monitoring activity - but that starts with making your son responsible for what he does on the web. IMO monitoring software is a poor substitute for parental involvement. Place the computer in an open area where anyone walking by can see the screen. Give him his own limited user account on the system, and put a password on the other accounts so that he's forced to use his own account. Let him know what behavior is acceptable and what is not - and if he doesn't follow your rules, yank his internet privileges.
But, don't "spy" on him. That'll teach him to distrust you. FWIW, what I did with my teenagers was to monitor traffic on my router on a periodic basis (I use a syslog capable router, static IP addresses, and a free program called WallWatcher to do this). When they were younger, I forbade downloading music and watching porn (and told them I'd be monitoring it). The consequences for P2P activity or a visit to a porn site were withdrawal of their internet privileges (which I did many times
As they grew older, the rules changed. They've just gotten their internet privileges back after 6 months of doing without - and now there is only 1 rule (they're 17 and 19 now). If my network gets a significant increase in attempted penetrations, they're cut-off. No warnings, no notice, and they won't get it back until the attempted penetrations drop back to an acceptable level.
If you're worried about MySpace, AIM, chatting, etc - there's no substitute for teaching them about the bad people that are out there.
Finally, spying on them will only make them more creative in finding ways around your spying.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
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