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Twitter banned third-party ad networks after people had put a lot of work (and $5M of funding, in Ad.ly's case) into third-party ad networks.

And Facebook tried to screw over Zynga when they saw how much money they could be making if they forced Zynga to give them a cut by using Facebook's currency. Besides for that, they've been very good to developers. But that's a pretty egregious offense.

i detect sarcasm here.. out of 4 points only one focuses on developer community. I only bring it up as a point to support the argument.

Facebook has only released Cassandra, Hip Hop (PHP), and Thrift to the open source community. Not like these are that important.

Am I missing some sarcasm here? All of those are pretty serious pieces of engineering that we should be thankful to them for releasing freely...