Actually, I've always seen social networking and the amazingly easy access to private data through such websites much worse an enemy than a private cloud storage.
Yes, both can be hacked, but even "my grandma" knows how to use Facebook and get all the private information she needs from a friend.
I personally am getting more and more interested in the Microsoft Surface (with 8 Pro) with each day. It is very intriguing to me that I can use it however I want to; on the go & out and about, it's a simple tablet for social interactions, and if I need to sit down, I can whip out a keyboard, load the desktop and do some work - or even a mouse and play some games with friends. Hopefully... The current spec sheet doesn't show much info for the device.
The thing is, with today's smartphones, the line between PCs and... idk, anything else, is getting thinner, but that doesn't mean that the PC is dying, I think of it quite contrary - everything is becoming as powerful as the "old" PC and it just takes different forms. I mean, just look at the Windows Phone platform and then Windows 8. WP phones are already half the PC we own... in a way.