This is morbidly fascinating - Jason Calacanis has decided that Facebook (and social media in general) take too much time and effort to keep up with. Which is fine; last time I looked, these systems were all voluntary. Which makes Scoble's comments interesting - he's trying to convince people (Jason in particular) that Facebook is worth the time.
Here's the thing - it probably is, for those of us who aren't celebrities. We can keep our friends list to a reasonable size, and join (and create) groups that make sense for us. For celebrities? Either they're like Scoble, and they can revel in that level of attention, or they're like Calacanis, and it just gets overwhelming. For me, it works, so far. I don't spend much time on it, and I haven't gone nuts with the Facebook apps. I'm not actively going for a huge web of people - I'm more interested in connecting up with Smalltalkers who happen to be on Facebook.