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There is no moderators on Yahoo anymore seemingly.
If you have questions and answers being removed it is quite simply because enough other users have reported you.
What the reasons are is unknown to anyone except the person that reported you. Perhaps you upset a group of grammar Nazis that took issue with your typing method. It could be anything. Who knows what goes on in the minds of the weird and wonderful.
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Posts are removed when enough users report them as violations (there is NO specific # of reports required to get a post removed, it varies).