Dustcloud is an interesting new Kickstarter project that has me intrigued. The idea and proof of concept evolved in Prague during 2012, while the people involved worked together in a bar in the old city. They came up with a spy game, and started brainstorming how they could make it work online. The result took them to China to design hardware, and resulted in an ambitious project. Their goal is to build a combination social network and online role playing game based on cold-war era espionage and assassination.
The only issue is that it's ultimate success will depend greatly on rapid adoption. In Europe it would be easier, as travel between countries is much more common, but in the USA unless a large number of players in major cities are involved it would become boring pretty quickly. It is definitely an interesting idea, and one that I plan to keep an eye on though.