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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Search catalog for libraries around the world.
A web search engine, called Yandex.Search, owned by Russian corporation Yandex. It is the core product of Yandex.
a file-hosting service.
a communication service, enabled by the Microsoft Cloud, that features messaging, audio and video calls, online meetings, and sharing, all in one app. Conversations are pr…
A website covering urban legends, Internet rumors, e-mail forwards, and other stories of unknown or questionable origin.
The support ticket system of SourceForge.net, for reporting bugs, support requests, feature requests and patches to projects hosted at SourceForge.net.
Note-taking app and organizer. Ceasing operations on June 25, 2014.
A social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators.
For questions specifically about the reCAPTCHA service by Google.
For questions about the [Strava](http://www.strava.com) web application, not the mobile apps.
a desktop and web program for managing and sharing research papers, discovering research data and collaborating online.
A lightweight, agile project management tool for software teams.
A service to update different search engines that your blog has updated.