Reddit Moderators, Forum Moderators, Chat Moderators, Blog Writers, Open Source Developers.
The Internet is built on a lot of great people doing things for free. That doesn't have to be a bad thing if you are okay with it. But always make sure you feel good about what you are doing. If you get enjoyment or a sense of accomplishment (to quote EA) out of it then it's no worse than playing a video game or watching a tv show.