Regarding "Keybase is end to end encrypted", it's sorta true but comes with an asterisk. I answered the sibling comment who asks that question directly: https://news.ycombinator.com/item?id=21741466

It's a relatively minor issue though (and one they could fix at any moment, it's not a crypto flaw but a verification flaw), so it's probably fine to send sensitive data over it. Definitely better than what most people use :)