Granted, any single Twitter user has their own biases, just like any single reporter, but if its coming directly from the source, the content is at its root its purest possible form, before it makes its way into the newsroom to be curated or elaborated up
Theres something to that. Of course, on the flipside of that you get a lot of noise and a lot of credibility questions, and thats where that curation comes in. Its up to the news consumer to establish sources they trust, and Twitter can actually be good for that too, thanks to search the crowd. Different perspectives from different users.