I don't really know if spamming has gone down a bit with the new profile viewing and wall thing. I think it has ...to an extent. There used to be so many threads where it was pure 2-3 people having personal convo.
I mean, it's nice to have interactions, but it's better if people can also have something else in their post besides one-liners to another member. At least that keeps the general topic going and not off-track.
If they see something that someone posted they really find interesting and want to reply, they can always to go that person's wall and post there, instead of where they found it first.