If there is no personal information, what is to stop me from creating a new ID? I personally find this idea at least as worrying. I don't want to be having to put my name on a list for every given community I belong to.
Your friends verify you as a unique human, generating a web of trust and a cryptographic fingerprint you can use to identify yourself as such. This fingerprint doesn't contain any more info about you other than you are a unique human, and you can provide a different fingerprint to each app you use.
