There are some people who are lucky enough to have friends that have the same drive to succeed, but I think they are in the minority.

I found my co-founder through the co-founder wish list. I couldn't be happier. We were not good friends at first, but friendship comes easily when you are both working hard towards the same goal.

Something that is super important (other than skill) is motivation. If you've got to do some convincing to get a friend to work with you on an idea, it probably won't get too far.