Do you feel like you have to respond to everyone response?

yes i also feel the same most of the times. Not at times when any response to my discussion is not that much sensible.But i have herad that commenting on responses is good practice here as you can enhance your rating and all.

Not all of them. Some of them need a response and some don't..it could be because my discussions are mostly very general and once I have what category they fall into there's nothing much to respond to. So, I respond sometimes and not everytime.

I only reply to those that I feel I want to, since there are times that the response are only a repeatition from a previous poster. I used to do that berfore, say thanks to them and bid them good day. But it is time consuming and it is not proper, so I decided to answer and comment only to those I feel that responded fairly for the benefit of the doubt..

I always respond back whenever someone takes the trouble to read my post, and then takes the time to answer. It think it's just the way we were brought up. Sadly this type of old-school behaviour (like sending a bread-and-butter letter) is not so popular anymore. Pity....