Mainly news, yes. Rumormongering is big, though probably not as much as on other platforms where the origin of a message is hard to trace for ordinary folk, but

Mainly news, yes. Rumormongering is big, though probably not as much as on other platforms where the origin of a message is hard to trace for ordinary folk, but again, if one has used this service for a while, and know the nature of the posts a handle typically makes, it becomes clear which is news and which isn't. Also, it is rare for all MSM people to RT the same non news without their colleagues raising suspicion, so it is not that bad. All that said, pruning is an indispensable activity for twitter.