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Facebook 是一個聯繫朋友、工作伙伴、同學或其它社交圈之間的社交工具。你可以利用 Facebook 與朋友保持密切聯絡，無限量地上傳相片，分享轉貼連結及影片，還可以幫助你增進你對朋友的了解。

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Twitter is without a doubt the best way to share and discover what is happening right now.

Docstoc is a community for people to find and share professional documents. Find free legal documents and free business documents.

ENLASO (translate.com) offers professional translation and localization services, including: software localization, website translation, and documentation translation and localization solutions.

Diigo is a powerful research tool and a knowledge-sharing community

Annotate Chinese Text with pronunciation and English definitions

Music, movies, TV, shows and now friends. Get connected on iTunes 10.

Quizlet is a lightning fast way to memorize vocabulary lists. It

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