No idea, but I was just trying to answer some questions. I remember vaguely that I needed some points to help and I needed to help to get the points, so... I shrugged and let it be.
If a question is very popular, a lot of people think it's like a normal forum and post “me too” answers. (Or, at least, they used to, before everyone knew Stack Overflow.) So there's a mechanism to “protect” questions so you need at least 10 rep (on that site – the “you contributed lots on another site so probably aren't a spammer” bonus doesn't count) before you can answer.
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