The article talks about guarding our time and relationships as social networking sites grow.
This neatly parallels some recent experiences of mine with LinkedIn. Scott Loftesness (which is where I saw the pointer to the article) echoes thoughts I had on LinkedIn a while back:
I'm finding there's just not much of a "there there" for me. Nothing that draws me back to regular usage. Somehow expanding LinkedIn's view of my network just doesn't get me excited -- like they think it should! There's certainly nothing there I'd be willing to actually pay LinkedIn for!