Peer-to-peer networks are playing fast and loose with your personal information, according to the USPTO
The report is rife with examples of ways that programs fail to disclose, or willfully disguise the extent to which users are making their private files available on peer-to-peer networks. In some cases, the programs have been shown to continue sharing files and folders even after users have deliberately deactivated sharing features.
"Identity thieves were searching for inadvertently shared financial data (while) pedophiles were searching filesharing networks for hard-core child pornography — and for inadvertently shared data about particular children."
I have never used P2P simply because I've never trusted it. I know people who do and most have not had any problems "that they know of" and a few have been infected by more malware than you can shake a stick of memory at. 3-4 years ago I had friend tell me how great Kazza was and that the version they had didn't have any add/spy-ware in it , "Yeah right" was my standard answer (still is ) .P2P started off as a good thing I'm sure, but it was too easy to take advantage of , it's like any thing else, If it can be used for good , then it will be used twice as much for evil.
I don't pretend to have a answer for what needs done , but it's readily apparent that "something" needs to be.