Well the first one is the beginning of a comment thread, the other two are replies to the top one. If you click the top one you see that there are multiple replies and he appears to be a troll.
Looks like he is either farming karma, or running some kind of experiment. I found several visited links in his submission history (and all of them reposted 5-6x).
I don't remember seeing any responses in my data set. I think I have seen him respond to comments before, hence where I got my inspiration.
I also know that he has people who actually are connected to him (he friended them back) and their comments appear to show up differently from the regular followers.
He does reply to those comments a lot more, intensifying the illusion that if you write to him, he will read it.
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