Kevin Rose, who founded Digg way back in the day, and who has invested in Twitter, Facebook, and...MEDIUM, has joined Steemit.
I haven't been able to find his handle yet, but it appears that is already taken. If you want to chime in on Twitter and welcome him, this tweet is right here.
Hopefully he'll have a good experience here. This is a good thing for Steemit and cryptocurrency-backed media.
UPDATE: Kevin said on Twitter that his account hasn't been approved yet.