近年來，隨著網路的普及，也有越來越多的企業開始在網路上建立自己的品牌社群。根據台灣網路資訊中心(TWNIC)發佈的2011台灣寬頻網絡使用調查報告，目前台灣的上網人口已經達到1695萬，較去年增加了73萬。在這樣一個趨勢下，Facebook、Twitter等社群網站更是成為新一波數位時代的重要媒體。因此有越來越多的企業開始在Facebook或是Twitter成立線上的品牌社群，並希望透過社群的力量來企圖影響消費者。

然而，目前國內外關於品牌社群的文獻中，鮮少探討當品牌社群面對產品契合度低的延伸產品或是品牌負面新聞時，品牌涉入度和品牌社群認同度對延伸評價或是母品牌評價差距之影響。因此，本研究乃以國內品牌社群為研究主題，並參考國內外相關的研究，以星巴克和漢堡王之品牌社群為研究對象，針對前述議題進行較深入的研究。

研究結果顯示，品牌社群認同度高的消費者對品牌延伸的評價會比品牌社群認同度低的消費者高，品牌涉入度高的消費者對品牌延伸的評價會比品牌涉入度低的消費者高，品牌社群認同度高的消費者對母品牌評價的差距會小於社群認同度低的消費者，品牌涉入度高的消費者對母品牌評價的差距會小於品牌涉入度低的消費者。最後，品牌商可參考本研究結果，採用正確的方法和對策，提升品牌形象、市場佔有率與獲利能力。

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