Ill tell you a story ( true one ). I used to be a member of the Lotus owners club. There was an internet forum and a lot the members worked in IT. Some real computer nerds/whizzkids on there from the city.
One of the IT guys got ripped off on Ebay, ended up costing him a lot of money so he sought his revenge. He had the guys address through the Paypal transaction. He did a little late night "research" and discovered who the guys GP was. He hacked into the local health authority network and sent the guy an official letter asking him to come in for a mandatory test for an STD. The test involves a swob down the japseye apparently!
Crime doesnt pay