As Facebook slowly opens up, it's becoming possible to pull your own data for your own purposes. Dave Winer mentioned one way, so today, in just a minute, I added a block containing my Facebook status updates to my website pages (see the column on the left). I'm not entirely thrilled with the way it displays, so I may write my own module. At the moment it's just stock Drupal RSS aggregator functionality.
I can update my Facebook status from my cellphone at any time. Within minutes that data is added to my own website.
There are two things to learn from this.
First, it no longer matters where data is stored, so long as we have open REST interfaces. We don't need One Database to Rule Them All.
Second, the phrase "everything is everywhere" applies to the trivial, the mundane and the uninteresting the same way it applies to the profound and valuable.