I'm playing around with Empire Avenue. It's a social media stock market in which you buy and sell shares in one another. It may hold promise because it might be one of those things you can leave on auto-pilot for ages and then come back to if you want to make use of its (future, coming soon) ad systems.
In order to verify I own this blog I need to include the code: EAVB_YRDIPOJLUX in a recent blog post.
In order not to waste your time with a temp post here's a rather good video from Leo Laporte on how they made the Old Spice advert.