Metaverse Identity on the Blockchain is a good long weekend read from Philip Rosedale, and while he's talking about avatar identities, I think the solution he's proposing could also become scalable to all kinds of online identities which get us beyond the real name-based IDs of Facebook, which are intrinsically full of flaws and subject to varieties of abuse. As I've said before, while Bitcoin is useless as a virtual currency, the blockchain code it uses to transparently track and register transactions is definitely valuable. Philip's idea is to use it in tracking and validating identities without tracing the blockchain-based identity with the actual person it's associated with: