I left a comment on this question expressing the the thought that it was a very hard question to Google (search) for. I did this to establish that we shouldn't be too hard on the questioner, even though it is a question that has certainly been asked before. That comment is gone. It wasn't a LMGTFY comment, so I wonder if it was misunderstood or if there's some bot that automatically deletes everything with Google in it.
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Users can flag comments as noise, offensive, or spam (using the little flag icon that shows up when you mouse over a comment). If a comment accumulates three flags (more if the comment is upvoted), it's automatically deleted. That may have happened to you.
I didn't see the comment, so I can't say whether it deserved to be deleted. I do see a lot of flagged comments (in the 10k tools) that, in my opinion, shouldn't have been flagged.