Social applications rely on relationships between users. Different applications describe these relationships using different terminology. The terms contact and friend are the most widely used terms to describe user relationships, but some sites use unique terminology, such as user's circle or follower. Clever applications sometimes refer to friends or contacts within the theme of the game. For example, a clever war-themed game might use the phrase "recruit fellow warriors for the mission" instead of the more generic "invite your friends to play the game by giving us their email addresses."
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