A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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A mobile app that enables its users to create and post short video clips.
an online service for sending payments to any friend/contact. You can use it from a mobile device or from a browser.
Service that allows sending up to 2GB per transfer to any email address.
a file-hosting service.