It is mostly used by more advanced users, and you’ll not find easy explanation on their site of what it is for, and how it is used, so you might read Quora: What is Keybase in laymans terms, Quora - Why should I use Keybase, the bit technical Introduction to Keybase and check wikipedia:
If you want to dive into a huge amount of discussion on Keybase, then this Hacker News search is for you.
One thing I do not like of Keybase (and the reason I did not yet try it) is that it is a commercial company, but nowhere can I found how this is set up, or how they do raise money, etc. Best info I could find was in this blog post and in their Jobs section they state this:
Keybase is a small, well-funded company of idealists who love what we’re building. Our team and investors come from a variety of early roles at OkCupid, Reddit, Tumblr, Facebook, and more. We enjoy:
- bringing privacy & security to the masses
- making apps & interfaces
- ping pong & peanut M&M’s & LaCroix water & team outings.
I just asked a question about this on Hacker News (let’s hope it reaches the front page): https://news.ycombinator.com/item?id=19300401