I'm a firm believer that there is something to learn from everyone. In this case, The Facebook's creator has one quality we can look up to: an aggressive drive toward accomplishing a goal. He had an end in mind and would not accept failure. This is an admirable quality. He wasn't worried about perfection. He wasn't worried about what people thought. He simply knew that this was what he wanted to do, and he drove toward that end.
Unfortunately, there are many bad things we can learn from this portray of Mark, like don't forget your friends. Don't steal from others; ideas, money, or anything. Don't be a jerk. The list could go on.
Sometimes we get so caught up in doing things perfect the first time that we forget to just do. Sometimes we get too caught up in how other people are going to view us for doing what is important to us. Sometimes we just don't think we're good enough to accomplish anything big. Sometimes we just need to follow our heart, and do what we put our minds to. If it makes us $26 billion, that's just icing on the cake.