It's not terribly surprising that twitter is full of uninformed bullshit, what do you expect? It's essentially web diarrhea as it encourages people to gush the first thing that comes to mind. Informed discussion takes actual thought and dare I say reasoning, neither of which lends itself to the twitter format. It's just background noise.
What concerns me is that the conventional media is taking their cues and sometimes even stories from things like twitter. Hearsay from unmoderated and unverified sources suddenly becomes fact. A case in point was yesterday the BBC said that the Mexican government was underestimating the crisis on the basis of that's what people said in an online forum! They are treating these probably uninformed and definitely fearful anonymous people as "feet on the ground" and using their statements when they can't even begin to verify the veracity of their statements, or that they are even local to the event.
I'd never state that the media used to be a paragon of virtue and accuracy, however they used to have to work for it. Now they are trawling forums and twitter and treating it as gospel, which is bad for everyone if the news becomes completely inaccurate they will destroy their credibility and if that happens what sources can people trust?
I'm not saying close twitter down, if you like it then go wild, fill your boots. I'm just saying that anyone who uses it as "factual" data should be dragged over a bed of gravel, dipped in vodka, and then rubbed in salt.