I think it's more that they are just starting to advertise the same way that all other companies do. More and more they're evoking emotional responses from the ads' viewers, rather than listing technical features and productivity measures.
Apple was probably one of the first, really. Look at the early Macintosh ads: https://www.youtube.com/watch?v=zCL1c8JCepg
I, for one, thought the video was pretty well done. If I had a Facebook account that I frequented, I would certainly be interested. Hell, it makes me a little envious of people who have genuinely interesting things pop up on their Walls (do such people exist?).
Queue up someone commenting that their feed doesn't look anything like the polish of a feed in a Facebook ad. :)
If they have smart integration with news sources / blogs (they showed BBC and the Atlantic I think) that could show me news that matches my interest but isn't spammy, this could be a reversal for them; I might not go to Facebook for friends, and Twitter for news/ more intellectual stuff.
Edit: Changed "Silicon Valley" to tech...since this common feel is more about the latest trends, than geographical boundaries. Though the joke no longer makes sense.