5 years ago, after witnessing Facebook's success, I remember a couple of my friends talking about how they were going to build their own social network.

How stupid does that sound now?

The entrepreneur in us wanted to mimic Facebook. But what the entrepreneur in us should be more excited about than ever is that Facebook has already been built. The foundation has already been laid for you. Everything and everyone is already here.

It's never been easier to build whatever you want. Just do it on Facebook.