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Well actually, it might be the case that their private keys have been hacked -- I've seen this happen to a few well-known accounts since I started here last June. But I upvoted and responded positively to another comment from that account a day or two prior, so if it was hacked, the hacker didn't change the private keys...

Hmm. Those are the exceptions, I guess. Because I've seen it on some other guys post where some other guy's comment was plagiarized just to have a feel among the early commenters of the post. I'm happy with what the OP did. He smartly discovered that the comment was unoriginal because the plagiarist did one hell of shabby editing. Lol
Now, I think the tide is gradually changing from "good post, thanks for sharing" to plagiarizing comments of others.

(Ahem, I am the OP... :) )

Yeah I have definitely seen it from more accounts! Only a couple of the accounts I've seen that behavior from, said that they had been hacked. I remember one guy even had to create a different account since they changed his keys, but he did eventually get his account back. Don't recall who, but it was one of the "bigger folks" on here -- not sure if that meant wallet, or rep, as it was in my earlier days here.

I'm happy with what I did, too. :)

wow!. That's a serious one. Learning security above anything else is crucial in this space.