The Atlantic
Dan Sinker's @MayorEmanuel had nearly 2000 tweets in five months and collected several times as many followers as Rahm Emanuel's real account, reports Alexis Madrigal. "[Sinker's] secret was known only by his wife, a small circle of friends, and one Chicago Public Schools teacher, Seth Lavin, who figured out Sinker's identity when Sinker used his personal account to shorten a link that @MayorEmanuel later tweeted."