The angel investors' world is fascinating.
They are at the forefront of what's happening, and you could even argue: they get to decide what's going to happen.
If you are in the startup world, you probably need to listen to them and to learn from them.
I wanted to understand how they interact with each other. I used the
AngelList API to list them, and the
Twitter API to find out who mention/retweet/favorite/reply-to who, how often, etc.