Keybase is a key directory that maps social media identities to encryption keys (including, but not limited to PGP keys) in a publicly auditable manner. Keybase is a very useful tool and I recommend you check it out. There are several very cool people on Keybase with whom you can chat and share ideas.
Today I couldn't bring up Keybase on my phone (Android). The error it gave me was not helpful - indicating that my phone lacked a network connection.
I checked the app store and saw there was a new version so I upgraded the app (something I rarely do since most app upgrades destroy user experiences in favor of more advertising). After the upgrade Keybase didn't recognize I me as an existing user (annoyance #1) and asked me to login. After attempting to login Keybase continued to wrongly insist that my phone lacked a network connection.
After doing some reading online I revoked my Keybase moble client and tried to login again. No dice - Keybase still wrongly insists my phone didn't have a network connection. As a last resort I tried turning off Blockada (an excellent way to block ads from appearing in apps). That did the trick - I was finally able to login and re-authenticate my phone to Keybase.
I hope this post helps you if ever have this issue with Keybase.
Update: it just happened again. I think there is a serious bug in the Keybase android app.