I've been thinking about this recently as I've been running more or less a private blog for my family. Sometimes I wish I could share parts of my messages with

I've been thinking about this recently as I've been running more or less a private blog for my family. Sometimes I wish I could share parts of my messages with friends, too. I'd like to mark one post as "for friends and family" and another post as "family only" or "friends only". I know this is technically possible and I could probably do something about it, but my point is that the desire to present different parts of ourselves to different groups is common and reasonable and it would be great to support it in identity systems. One approach might be that your "identity" is merely an opaque user-controlled keypair and that the meaning of that "identity" is determined by others. At work that identity might mean Employee 493293, and at home it might mean "Bob". Of course, better to give one pubkey to work and use one pubkey at home. But regardless what the identity actually _means_ is determined in the context where it is used, just as today I might be called by one name by one group of people and another name by another, with my appearance being the identifier.