[cauch]

People may grow up or may not grow up.

If at 20, you don't act like that, then there is no question (and it is possible. In my 20's I was briefly a webmaster for a small org, and I noticed I had access of private info, and unlike Zuckerberg and you, I reported it to get it fixed. It does not mean you are a bad person, but it does mean that you should not consider that everyone would act like you did and that your way of acting was "normal").

If at 20, you act like that, there is a probability that you will grow up, and an even bigger probability that you will not grow up. It does not mean you should never be forgiven, but you have to own what you have done as a dumb kid, not just pretend it does not count, and provide elements to demonstrate that indeed you have changed.

In the case of Zuckerberg, his current actions demonstrate clearly he did not grow up.