Ok so you made me reasearch vests are shares(I dropped a link on discord) in the steemit company..about the witness I think you can vote for 30 witnesses but there is more information in this link also https://steemit.com/steem/@steemitguide/steemitguide-what-is-a-exactly-is-a-steem-witness-and-why-every-user-should-vote. I use steemnow.com rather then then one you use..but I will probably give it a go on steem block explorer..