I don't want to give the link because you may vote down if you see the answer. The answer is totally useless and not related to my question. However, I can confirm that the author spent a lot of time on his answer. What should I do to recognize this (useless) contribution?
I have thought of four choices:
- Do nothing.
- Vote the answer up to thank him for spending his time.
- Vote the answer down, because useless it's useless.
- Leave a comment to thank him for spending the time, but tell him that his answer is totally useless.
I think 4th option is good, but it's too rude!