One really nice aspect of keybase is that it can be used at a number of different levels that suit one's own flavor of paranoia. You can use it as a key reposit

One really nice aspect of keybase is that it can be used at a number of different levels that suit one's own flavor of paranoia. You can use it as a key repository, just grabbing people’s keys and using your own PGP/GnuPG apparatus for signing. Or you can use their (much more pleasant) CLI and see their social identity tracking data. Or you can use their web UI just for client-side encryption/verification (also without uploading your key anywhere). Finally, the bold can upload their keys and use the web UI for the whole shebang, including decrypting/signing. I think paranoia is warranted in this day and age, and I think one of the best outlets for paranoia is for people to try and educate themselves about privacy technology. Keybase is a great opportunity for that, since all of the most sensitive operations happen client-side via open source software.