Twitter is ill-suited for nuanced, in-depth scientific discussions. The tweets are only 140-characters after all, and it is difficult to follow a conversation because every single tweet is a separate web page. Tweet materials that appeal to a general audience, rather than complex scientific papers.
Should scientific discussions ever be anything but nuanced and in-depth? I am a little concerned that Twitter is extending the sound bite culture of the TV watching general audiences into the professional arena. Not so good in my view.