Terrible? Rather interesting start point, I'd say. It should be trivial to install, maybe come preconfigured on a stick computer or even run directly in a mobi

Terrible? Rather interesting start point, I'd say. It should be trivial to install, maybe come preconfigured on a stick computer or even run directly in a mobile phone? The Dropbox functionality should be encrypted and download stuff only when asked for. With very carefully designed access rights. Ideally, people should feel safe putting nude sunbathing pictures there together with their girlfriend/boyfriend. And their sport tournament meant for the whole world. (Make it two small computers, one for (semi) public data?) Then add blogs with allowed comments. An 80% solution of FB, if the UI is simple. Add some P2P or global directories of people, so they can connect their servers. Some more features are needed to follow e.g. your favourite music bands and local music avenues if those only use FB. (My personal fear with privacy is that I'll end up on some terrorist list, then be sued for big damage by a police officer for emotional damage, because of my dullness and sense of humour. :-) ) Edit: If you and your friends backup your data, it should probably be an encrypted backup. But then, an encrypted cloud service function would probably be worth the money instead.