I just came across these two questions:
Both asked and answered by the same user. The first one is answered within 2 minutes with a link to a tutorial. I found this suspicious and thought that he was probably promoting the site to which he had linked.
Then I found the second question, which is an exact duplicate where he answered with a link to his first answer 3 minutes after asking the question. He was answering in a style designed to hide that he is the OP.
These are obviously not real questions, so I flagged them, but I'm not sure what's the right thing to do.
I don't think this is acceptable use of SO and this user has over 2K rep. In fact he gained 40 rep from these questions, when he should have been punished for them IMHO. He has over 200 questions and I don't know if this is a common behavior of his, but perhaps this should be investigated. I just feel like some kind of action should be taken to discourage this kind of abuse.