The document discusses some basic Twitter conventions: 1) The @ symbol is used to mention or reply to other Twitter users, like @JOMCParkLib which is the account for the Journalism School Library. 2) Direct messages (DMs) that start with @ are private messages only visible to the sender and recipient, like DM @JOMCParkLib. 3) Retweets that are shared from another user start with RT followed by the @username of the original poster, such as RT @lrainie.