I've discovered what I think is a false account being used to send free rep to a user on Stack Overflow.
Yesterday user nuclearpro posted an answer (now deleted) which was voted down to -10 over the course of the day. He posted a question to Meta asking users to up-vote his question to right this injustice, and was promptly downvoted on Meta as well.
Today I noticed that he's gone from 3 rep to 193 rep in a very short period of time, due to having his most recent 5 answers accepted as correct. I also notice that all 5 answers were accepted by the same user, Amy T, who has only existed since mid yesterday.
Both users seem to use the same lack of punctuation and capitalization (hardly a smoking gun) but the timing is a little too convenient. More convincing is the utter lack of content in the 5 answers in question; they were all accepted as correct despite being pretty poor answers by SO standards.