As much as we tout Twitter for its conversational abilities — for its revolutionary capacity to create discursive, rather than simply distributive, relationships with news consumers — many major news organizations are still using the service as, pretty much, a vehicle for self-promotion. A new study, released today by Pew’s Project for Excellence in Journalism, studied 13 news organizations, large and (relatively) small, from print, TV, and radio…and found that “mainstream news organizations primarily use Twitter to move information and push content to readers. For these organizations, Twitter functions as an RSS feed or headline service for news consumers, with links ideally driving traffic to the organization’s website.”