Old headline: "Joan Didion Tweets About Quitting Twitter"
New headline: "@JoanDidion Parody Account Tweets About Quitting Twitter"
And the correction that tells the full story: "An earlier version of this story said the @JoanDidion account was the author's actual account. It is a parody. The article has been updated." The giveaway: The account in question's bio reads, "Joan's tweets inspired by Joan (she dislikes [micro]blogs) and edited by a chill dude who writes and works in advertising (@erik_stinson)."