Can anyone remember a few years ago, where it felt like almost twice a week there was a new thing leveraging from Twitter in some way, doing something useful or something novel or something completely terrible? That was great, it created genuine value and drew more users in.

If you're a developer and you build on Facebook, or Twitter, or any other API, you now need to be ready for them to pull the T&Cs out and ban your ass and kill your project because damnit, we can't extract value from your additions that'll help us effectively monetize our customer base.

(p.s. flattr looks like a great service and I'm sure they'll find a work around, but they should have known this was on the horizon)