Social: Yeah, a lot of people aren't blown away by this, but that doesn't make it any less important when considering the market as a whole. One of the (many) reasons people bought the 360 over the PS3 was because all their friends had it. They could chat while playing, and interact with each other much more easily than trying to pair a bluetooth headset to the PS3. For the PS4 to embrace that aspect will make the console that much more attractive.
This is a good point and something I neglected to mention.
I have no console allegiance whatsoever; growing up in the Nintendo dominated era those were the systems I got (usually quite some time after they were released), and played Sega and Sony systems at friends' houses. In fact I hate Microsoft the most of all, and yet I am now a discerning consumer rather than an impulsive kid, and I own a 360 rather than a PS3. And you nailed the exact reason I bought it: I had lots of friends who had one and lived across the country or state, and it allowed me to be able to connect and play while chatting with them once in awhile. Whereas relatively fewer people I knew had a PS3, and I read some questionable things about its online interface at the time.
Now then, as is par for the course with Microsoft products, I've gone through three of them since buying the initial one about 5-6 years ago and there have been plenty of times I've cursed Sony's name for their initial missteps with the PS3 that indirectly caused the circumstances in which I voluntarily shelled out for this piece of shit.
So yes, it's imperative that Sony makes it intuitive and easier to play with friends, although I don't think that necessitates an instant share button, Facebook linking, etc. at baseline. But we'll see; maybe those features will end up being well integrated and widely used after all.
-J