I have noticed that mobile alerts from Facebook have shifted from m.facebook.com to fb.me URLs. While it certainly creates a cleaner URL, it will be interesting to see if this is a step towards other larger initiatives:
– user analytics / fan page data
– integration with feed posting and FB Share
– focus on ‘notes’ and external link sharing
– Facebook Connect integration (?)
And, based on the above opportunities, it will be interesting to see how (if at all) this impacts folks like Bit.ly (who have become prevalent on Facebook after dominating Twitter).