What about this scenario, g-mady?
You're sitting in the pub with a group of mates discussing, say, which is the bestest helicopter in the whole world ever. As always, the group puts the world to rights and you come up with the definitive answer. The conversation then moves onto another topic.
Another friend comes into the pub and asks everyone what they think the best helicopter in the world is. You have a short discussion and tell your mate that you all came up with the definitive answer 5 minutes ago.
Then another friend comes into the pub and s/he too asks what the best helicopter in the world is. What happens next? Do you all have the same conversation for the third time or groan and then tell him/her to move on?
Well, the same applies here. Only on a forum, you have the ability to 'rewind time' and point your buddy to the discussion that they've already missed. (And that doesn't even include the wasted server space that multiple, repeated discussions on the same topic fill up.)
Any clearer now?
