to perform information reconnaissance using the Internet - to find out information about a person, without his or her knowledge - mostly accomplished with the help of Yahoo, Google and Google Groups.
frowned upon because it's a slight invasion of privacy - and because the information isn't coming directly from the person. information recovered during digging can never be exposed to the person.
I did a little digging and found out he runs this site called the Urban Dictionary - you won't believe what I found there!
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