I've never been much engaged in FB,TW or Instagram or too many Social platforms. But I still have to disagree with Mr Linus, after all where would we be without the Slashdot effect?
Social media simply accelerates aspects of what we are as humans. Its well known that we humans are genetically more attracted to the negative than the positive for obvious reasons ... and just to be circular: when was the last time something positive Linus said made the news?
So rather than say Social media is an external invading disease i would rather say it is an expression of what makes us human.