Jonathan Zittrain

With the rise of software patents, engineers coding new stuff - whether within a large software company or as kids writing smartphone apps - are exposed to a claim that somewhere a prior patent is being infringed.

I don't know how much thought is behind it, but it seems to me highly effective the way that Facebook will let somebody tag a photo with a friend's name, then others who are a friend of that friend can perhaps immediately see the photo, and the friend, in the meantime, has a chance to wander back and un-tag it.