Personally I hate the "cram social media into everything" attitude. Like just the other day I bought some lil' watch batteries online for my mother's car key/alarm thingie, and Amazon asked me (as it does for every damned purchase) if I wanted to publish the fact to FaceBook. How 'bouts NO?!
The sad part is, I might want to tell a friend or two about some things (be it purchases, gaming achievements, whatever), and chances are I would use FB to do that - but I'd address it to them specifically, not "publish" it to my own wall or whatever. Because if I publish every piddling little thing like buying batteries to my wall, nobody pays attention when I do have something genuinely interesting/important to say.
There's also the issue of the PS4's "share" button coming at the cost of the "select" button. This I don't like - since a major limitation of consoles is the severely limited number of buttons on the controller, you need to be damn sure every button does something useful. And the number of useful buttons on the PS4 just dropped by 1. While I'm not a console gamer myself, a major point of irritation for me is the fact that every PC game nowadays is a port from console(s) (alas, never the other way around, even for traditionally PC franchises such as TES), and devs are usually too lazy to re-separate functions for the PC port when they have more buttons available. Case in point, I remember great frustration on Mass Effect 2 (back when I could stand to look BioWare in the eye, figuratively speaking), when "sprint" (which they bloody-mindedly insisted on calling "storm" for unfathomable reasons), "use", "take cover" and "vault cover" were all bound to [e]. I remember many deaths when I tried to sprint to change cover, and ended up magnetically sticking to the exposed side of other cover. Most frustrating when I have enough buttons to have one for each function if only the devs gave me the option.
On the positive side though, it's nice that they're adding a convenient way for console gamers to record/stream. That's cool. If only we could get the industry to realise that "let's play" videos are free marketing (and in my case, perhaps the singular most powerful form thereof), when some of them are still trying to leech revenue (looking at you Nintendo, not cool) or putting the big ol' copyright censor jackboot down (dick move, Sega). And the double-edged sword to this is that we'll see a massive increase in the amount of content out there while the average quality will likely drop - the ones who go to the trouble of recording "the hard way" are generally the ones who are dedicated and skilled enough to have earned the right.
Wow, I do seem to have rambled eh? I'll summarise:
TL;DR:
-Overuse (eg via a dedicated "share" button) devalues a "wall" to the point of worthlessness (vaguely ironic, or is that just me?).
-How many of even your facebook friends really wants to know you just defeated your 10,000th radioactive sheep?
-Dedicated "share" is a wasted button, and even PC gamers could feel the button-shortage filtering through.
-Allows consolers to record/stream conveniently (for better or worse).