QUOTING SOCIAL MEDIA
Reuters, originally a British news agency, calls it "picking up," and the Reuters website's discussion of quoting social media is helpful.
The Reporters Committee for Freedom of the Press has definitions, explanations and guidelines for avoiding libel.
The Electronic Frontier Foundation, which focuses on online news, also has a good libel overview site.
The Digital Media Law Project has a good discussion of actual malice, as well as guidelines and discussion about libel (DMLP is hosted by Harvard University's Berkman Center for Internet & Society).
What's Twibel? Just a catchy name for libel on Twitter. The important thing to know is that defamation is an issue on social media as well. Attorney Cara Adams' post is a good introduction. And these tips, intended for a broader audience, are good for journalists to keep in mind.
WHAT LEGAL PRIVILEGES DO REPORTERS HAVE?
The Reporters Committee for Freedom of the Press provides a helpful state-by-state guide to reporter's privilege.
NEW YORK TIMES COMPANY v. SULLIVAN
"There may be no modern Supreme Court decision that has had more of an impact on American free speech values than the landmark New York Times Co. v. Sullivan case," says this Forbes opinion piece about the continuing impact of the case.
Here's an overview of the case from the Oyez Project at Chicago-Kent College of Law.
This is the advertisement that led to this famous Supreme Court case. The ad, paid for by a civil rights group, describes the violent treatment of demonstrators by southern law enforcement.