Your analysis focuses only on Facebook. Of course people are leaving Facebook. But is the total user population of all social networking apps decreasing? I doubt it.
> First: a false equivalence and shifting goalposts. Your initial claim was "most of the academic research".
Poor phrasing on my part. My original goalpost was "the academic research like this," which is admittedly vague. What I meant was research projects focused on image processing and interpretation.
> Third: what you see as a useless toy has some pretty evident applications that I can consider.
I don't see it as a useless toy. I just think it's far less useful than social networking services, which have a very practical obvious benefit.
> Blindly claiming social media vastly exceeds the value of such research fails to pass the most casual of sniff tests.
It's not a blind claim, it's what I feel is an extremely obvious claim.