Good call to action.
Voting for witnesses is something new users don't bother much to do and it may be an excuse to use it for the first time.
Witnesses are miners that mantain the blockchain running and also develop third party applications.
Every user as 30 votes to spend which delegate or support a certain voting power (not the regular one around here) on the "rules" of the blockchain, which are not suposed to be always changing but according to consensus and from time to time, with proper discussion before hand. Since there was no pre-warning about all this, the witnesses are supporting a different version of the blockchain which is what is already built, and with some temporary block (1/2 weeks?) i supose on the major voting accounts which should be clarified how they are suposed to function.
So hopefully this is a call to action to new members to use that feature of steemit, see the work done, and suport the witnesses that are already here.
https://steempeak.com/me/witnesses