Their vision goes beyond sparing netizens the tedious task of manually writing captions or tagging photos. It's about taming the chaos of collective online sharing, and unlocking hidden information.

他们的愿景，已不仅仅在于让网络用户避免手动书写图注或给图片加标签的乏味工作，而是梳理大众在线分享图片的混乱状况，揭秘隐藏的信息。

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Facebook's most popular feature is photo sharing and tagging friends in pictures.

Facebook最流行的功能是照片分享和在图片里给朋友贴标签。

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The top five in 2010 are Social networking, Wikis, Peer to peer sharing, Video sharing and then a three way tie between tagging, RSS feeds and Microblogging.

FORBES: Business and Web 2.0 An interactive feature

While in store, they can track trip details including tagging merchandise they liked, taking and sharing pictures with friends for instant reviews, buying surprise gifts by reviewing items liked on the store website.

FORBES: When smart phones and smart friends go shopping together

Slideshare users can also manage collections of presentations, documents, videos, etc. and watch the activity and comments for each file, in addition to other common social business features such as tagging content, following other users, sharing by email, and tracking how many people like or reshare the document.

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