That said, I agree that sensitive or not, we really shouldn't be sharing everything over only a handful of communication channels (typically home & work broadband connection + mobile phone data connection). It makes surveillance all too easy.

This is where I think smart people could make a difference. When I want to share data with someone in the same location as me we should really be talking P2P only. It wouldn't allow NSA & co to get the same full picture as easy as they can now with central data hubs and only a few communication channels.