What I'd like is distributed p2p linking. No personal data on a server that isn't yours. Any of your data hosted on a third party site if you choose so, is encrypted to within an inch of its life: they can't do ANYTHING with it except forward it to whoever you designate.<p>Venn diagrams for your social graph. Or trees. Preferably both. If Yelp/Microsoft/whoever wants my data, they become a member of my social graph, not some all-seeing entity that hovers above me recording every comment I make. Data that goes to them is encrypted as well of course.<p>Make it distributed, because no company hosting user data will be able to resist the temptation to use it to make money. Or build it on top of Dropbox, and have Dropbox serve as the backup for your online social life, encrypted, of course. 2GB will eventually fill up, and hopefully people will be happy to pay for extra storage, especially if you make it easy.