Why do people on yahoo answers hide their past questions and answers?

People go through them and report them if they don't like you.

Yahoo needs to make anything over a week report proof if you want us to allow it.

Some, but not all of them, don't want people to figure out that they're point gaining, though there's usually other ways of telling. Others just want some privacy.

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If I were "the power's that be" at Yahoo, ALL Q&A's would have to be open.

Also: All who participate would have to accept messages.

Way too many who do mischief and hide behind being anonymous.

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i used to think that way, but then some people always refer to my past Q&A in my newer ones even when the subjects were different.

Report monkeys.

To keep the trolls out.

Because if not report trolls will report all their answers and questions.

I don't hide my Q&A. I leave it open for all to see.

They have asked the question several times or they will lose credibility.

So no one will get angry and report 20 of them.