That link goes to last year's GDC Home presentation... I think Sony made the URL
http://www.us.playstation.com/PSN/ redirect to that old video to confuse us, earlier I tried that same URL from work (got it from neogaf) and it was not going anywhere, just a 404 (page does not exist).
Here is what was at that URL earlier today:
http://farm3.static.flickr.com/2365/2263010919_3afaca553f_b.jpg
Read the "Friends and Messaging" at the bottom right.
It's very likely Sony has something to show us next week at GDC... can't wait :)