A lot has been written about Keybase.io, a public directory of public encryption keys associated with usernames and additional “verification proofs”. Yesterday, I was admitted to the circle of alpha testers and could grab the keybase.io/matze user name. Despite some initial problems, the website itself works just fine. Using the keybase client turned out to be a dead end though. It requires a fairly recent NodeJS and npm which are both not packaged for my long-term choice of Linux distribution. Thus, right now, the service offered to me is quite limited, because I am also not willing to upload my client-encrypted key.
I have four invites left, so if you are interested in trying that service, just drop me a line. And yes, I have a Twitter account for five years now, but this is and (probably will) be the last occasion that I use it.