[shaver]

Yes, you should block apps that you don't want to see. They are (per your reasonable definition) badly behaved, and you should exclude them from your stream. I think that's exactly the behaviour that FB would want, because it ties the utility/economics of those apps to the quality of their user-experience.

(Disclosure: I start at FB next week, though I don't have any inside info on this.)

[tlrobinson]

It's an ok solution for me, but unfortunately I think most users will just click "ok" so they can see their friend's link without realizing what they're actually agreeing to.

I think that's what Facebook wants: "making the world more open and connected"... at all costs. They're constantly pushing the limit of what level of openness users will accept. It's going to backfire.