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''Friends for Sale'' was a massively multiplayer online business simulation game originally developed by Serious Business, available as an application on the social networking website Facebook. The game allowed players to buy and sell virtual pets representing other players.〔 Since its launching by November 2007, ''Friends for Sale'' soared into popularity by June 2008, becoming one of the top ten Facebook applications with around 700,000 daily users〔 〕 and activity peaked at around 6.5 million monthly users in 2 November 2009〔 〕 until Zynga acquired Serious Business in 11 February 2010. ==Gameplay== Players begin the game receiving some amount of virtual currency, as well as the in-game value of the pet that represents them.〔 〕 A list of the player's Facebook friends appears, along with their selling price. They could be bought; given nicknames and gifts; put to work with, locked from, sold to and used to poke other players.〔〔 〕〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Friends for Sale」の詳細全文を読む スポンサード リンク
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