I like that as well.you can't scroll back on some things because they don't exist anymore. I see the trends-like a tidal wave that moves through my friends list. Then we're on to the next new thing. I'll see the same post 47 times on 5 other posts and then when I post something-n one notices it,but then they "like" their friend who posted the same thing later on...yeah time suckage and an adventure into vapid emptiness. Woot.
I only wished that we could "like" others comments on LJ. :)