That’s entirely up to you. It might come down to one of two things. You’re able to articulate a better answer than what has already been posted even though you don’t know it yet or you risk the chance of being redundant. I’ve been guilty of both of these possibilities on more than one occasion.
I think you should. I think everyone should. Even if you’re not giving a new answer and you might be saying the same thing as other people… Well, it can still give the asker of a question a general consensus of belief or opinion, which I think is always interesting in and of itself. :)
Funny thing. I have wanted to ask a few questions and went with Google first. First hit on Google was Fluther. Lots of people see what we write here even if they never join.
I agree with the above, but highly recommend that everyone who posts to a question requesting factual information read all the preceding posts before answering. Sometimes it’s painfully obvious that this simple courtesy wasn’t observed.
I don’t add anything if someone has already said what I want to say, because I usually stop reading answers when they start getting repetitive. I don’t think “Me too!” adds much.
(Maybe “Agree” and “Disagree” buttons, that keep a running tally, underneath quips?)
If I look over previous comments and feel I’ve nothing to add, I’ll find try to reference someone who said what I most closely would have in order to show support for a question I take interest in.