Apple’s decision to deeply integrate Twitter into their latest OS might just come down to the simple fact that Microsoft went for Facebook. Alternatively, it could also be that Apple’s goal is to sell hardware (where they make roughly 90% of their revenue) and the firm wants any given end-user to have easy access (of course, within iTunes) to ideally distribute their digital content among / between more than one device (hint; hint: which in their purview of the world would be an offering from Apple.
Furthermore; Twitter (vs. Facebook) is much easier to integrate as an API whereas Facebook is more of a closed community (and, in reality it might also be the case that Apple believes that their ‘walled-garden’ approach IS the only one that matters… and, that they are going to allow / deal with).
From Beta News: http://bit.ly/klO4VW