This document discusses how Twitter is used as a "second screen" for discussing television as it airs live. It allows viewers to comment and interact about shows as they watch. Key aspects of live tweeting include commenting on plot points, speculation about upcoming events, and interacting with other viewers and celebrities. However, live tweeting can also create issues like spoilers if viewers are not watching simultaneously. The document examines the types of programs people like to live tweet and what social TV conversations on Twitter typically look like.