This isn't new. When I was an analyst, some reporters would call me for a quote about something. There were times when I didn't have anything to say because I didn't know anything about said thing. But some would pester me for a quote anyway so they didn't have to give someone else a call.
Twitter does seem to have become a particular crutch though.
You should stop by /r/austin sometime, and just lurk. The amount of local reporters looking for some kind of pulse to put their finger on and even those nu-'journalist' sites (Vice,Vox,insert here) obviously mining for quotebait is absurd, and the community has been calling it out.
Of course, /r/austin isn't a remarkably interesting place to be anyway for a lot of reasons...it's just interesting to watch the "Austin" phenomenon manifested there. Different story though.
quality news sources, like NPR
I say this as someone who really wants to like NPR and struggles to find any unbiased news source.
Twitter currently has lists, but the problem is that these lists aren't crowdsourced (to my knowledge). They're maintained by individuals, which is unsustainable, because one person can only do so much work keeping a list accurate and up-to-date.
This describes virtually every announcement I've heard from twitter.
They often report about how some group of people on Twitter are angry about something -- as if that matters. Reddit has almost as many monthly active users lately, yet no journalist makes the mistake of reporting on Reddit comments as if it's generalizable to the larger population.