It depends Laffa on how much time I have. If I'm interested in a topic, I click 'subscribe to topic' I can then log-out, reply 'alerts' will be sent to my e-mail address, when someone replies, to that specific topic. (been experiencing problems with this recently)
Other times, I too, go down the the list, depending on mood (mine) & topic.... I'll reply straight away, or give it some thought before replying
I'm confused about what I do now LOL