The biggest accounts: @steemit, @freedom, @steem, @ned (the founder of Steemit).
As regards going all in on DTUBE, it's a great move. I'm considering doing same as well, but, not until I have some other aspects (of me) in place.
How about a "Zoom" Dtube dialog/chat for an idea? Been thinking of doing at least one per week with some selected Steemians.