I haven't but I've had two ideas I thought were fairly interesting.
1. Tomagochi app where your creature's features are representative of your friends friends. I.e. people with fewer friends will contribute more unique and interesting features to the creature and people with many friends contribute more material for making bigger creatures. This would motivate people to seek both ends of the spectrum.
2. Trusted distributed computing. People would bid for users' cpu time, and users choose who they want. Bids can either be money or promise of payout from the job's results.
1. Tomagochi app where your creature's features are representative of your friends friends. I.e. people with fewer friends will contribute more unique and interesting features to the creature and people with many friends contribute more material for making bigger creatures. This would motivate people to seek both ends of the spectrum.
2. Trusted distributed computing. People would bid for users' cpu time, and users choose who they want. Bids can either be money or promise of payout from the job's results.