I disagree and maintain that news organizations and information organizations like Facespace, Google News, Twitter, etc, should have a "reliability value" beside links or stories that a large number of users are sharing or reposting. Even if it's just a simple "2% of users found this unreliable information" or "97% of 104 users find this source to be reliable."
To say that the information distributors can publish whatever they want and the responsibility of information accuracy and quality must fall on the layuser, that's just poppycock. That's just a way for the giants to save money while we all get questionable data with which to live our lives. Unacceptable.