So there is this message that I saw for the first time today that says:
Welcome back! If you found this question useful, don't forget to vote both the question and the answers up.
Here is a screenshot:
This message asks me to upvote the question and the answers if the question is useful. But a question's usefulness does not necessarily have any correlation to an answer's usefulness. People should be upvoting answers if the answers are useful.
This message should thus be changed to either only ask me to upvote the question, or to mention finding both the question and the answers useful.