I don't think it's possible for mere mortals to use Twitter for news about politics or current events and not go a little crazy. At least, I have yet to find a Twitter user who regularly or irregularly talks about these things, and fails to boost obvious misinformation every once in a while. It doesn't matter what IQ they have or how rational they were in 2005; Twitter is just too chock full of lies, mischaracterizations, telephone games, and endless, endless, endless malicious selection effects, which by the time you're done using it are designed to appeal to whichever reader in particular you are. It's just impossible to use the site as people normally do and also practice the necessary skepticism about each individual post one is reading.
FWIW I would agree that Twitter is probably at least slightly bad for almost everyone. Those who are reasonable on Twitter are probably only so because they're even more reasonable in other fora.
Edit: Bad in the particular way being discussed. It can be good in other ways, like learning new information about the world.