So, the last couple of Facebook UI changes have been about making Facebook more Twitter-like, stream-oriented and conversation-oriented. With the recent announcements from Twitter's development-conference and Facebook's new stuff today however, the two companies are on clearly divergent paths

Twitter's future is about enhancing the value of real time*.

Facebook's future is about enhancing the value of identity**.

This is pretty much how it used to be, before Facebook did all that work to fend off a perceived threat from Twitter I guess, but having the two companies formulate their future vision within just a couple of weeks makes it clear how completely different they are.

* with more data and new relevance engines.

** sharing the identity to a broader audience than now, making it easier to mix in richer data with a profile.