I suspect the Apple/Twitter WWDC news is a classic Steve Jobs negotiation move in the broader Apple/Facebook relationship domain, but perhaps the ultimate strategy actually is more (Apple + Twitter) > Facebook
A relationship had at one point seemed natural. Facebook wanted to counter the threat of Google social products, while Apple was aiming to differentiate itself from the Android mobile operating system. Facebook for iPhone, the best-in-class mobile social networking app that has dominated the iTunes App Store for years, seemed to prove that millions of people wanted the two companies together.
Instead it has been Facebook’s microblogging rival, Twitter, that has gotten the special attention, as Apple reinforced yesterday at Apple’s Worldwide Developer Conference in San Francisco.