Earlier quoted context omitted.
Task: Send me a tweet on Twitter. Careful not to send it to any imposters. Challenge: Finding me on Twitter. For example, I am not @Nadya Extra Credit Challenge: Let's say I'm e-famous enough to have imposter accounts but not have a Twitter "verified" badge. Which Twitter account is the real me? And how do you know? Where Keybase comes in: On my HN profile itself you can find my signatures on Keybase. Keybase is not…
> On my HN profile itself you can find my signatures on Keybase. … or your HN account could just link straight to your Twitter account. I don't get what Keybase adds here.
Or you could collect all of your identities into a Keybase profile, which all of your other profiles link to. That's a lot less to manage. Plus, proving your identity at some site (usually) has the byproduct of pointing back at your Keybase profile, so even if you come at this just from a "less work for me" angle, you're getting verifiability for free.