I would prefer a sophisticated metric (popularity, karma) over a timestamp. I don't actually want to see last updates from all the people in my social graph, ju

I would prefer a sophisticated metric (popularity, karma) over a timestamp. I don't actually want to see last updates from all the people in my social graph, just the ones that are in some way significant. There was talk on filtering out stuff like #lunch on Twitter, but it's hard to really make a CAPTCHA judgement on the semantics of an update.