Re: Big Data?
"Ponzi scheme, Bubble also come to mind."
I also suspect that much of it is like squirrelling away useful looking answers from technical IT forums.
There comes a point when most of those answers cease to be of interest, simply because the products concerned have evolved, introducing a new set of questions, or even ceased to be.
You may be able to re-use that data for other research, say linguistic analysis (thinking of AI here), but there are plenty of other sources for that.