Many new users on Stack Overflow don't understand the meaning of the right of "vote up" for answers or questions. At the beginning (until they reach 15 reputation points) the user can't "vote up". Later some users don't use the right and don't really understand it.
I suggest that the users who have the right to vote and do not use it will receive automatic comments on their new questions with links to topics describing the voting. One can define the starting point of the comment generation either as 15 points or some higher level (like 30 point) or a more complex rule. One can make the rule depend on the total number of asked questions for example.
In the same way many people who do not accept any answers on their questions do this just because they do not know how to accept the answers or because they do not understand that accepting is really important. So instead of writing the messages (comments) manually with links to the link for example the Stack Overflow could generate the comments automatically.