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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Free email service owned by Google. It supports POP3 and IMAP.
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Social networking service founded by Mark Zuckerberg. If you're developing apps for Facebook, check out StackOverflow.com instead.
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One of productivity apps in Google Drive, that allows you to create and edit worksheets
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For questions specifically about the web interface of the file synchronization and cloud storage service from Google.
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Questions about Google on a broad level and concerns one or more of the following web apps: Google Search, Google Maps, Gmail and Google Voice
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The card-based project management tool by Fog Creek Software. Please send bug reports and feature requests to the developers directly.
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Video hosting and sharing service from Google
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Questions about the use or functioning of any and all web-based email such as Gmail, Outlook.com, Yahoo Mail, etc.
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For anything relating to Google Apps - whether the free version, Enterprise, Education or Government.
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Free microblogging webapp that lets users share "tweets" of up to 140 characters in length.
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off-topic on Web Apps Stack Exchange
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Social networking service owned by Google.
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Calendar and time-management system provided by Google.
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Search engine owned and developed by Google
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Type of Facebook profile primarily allowing users to sign up as fans or connect with a brand, celebrity or organisation
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Methods and/or means to allow users to better control access to their data used by a web app
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Ways and methods to look up data and information from a service, index or some other collection of information
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a free web mapping service and API provided by Google.
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Microblogging service that allows text, video, images, links and quotes
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A branch of computer technology known as information security as applied to computers and networks.
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a JavaScript cloud scripting language that lets you extend Google Apps and build web applications.
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Accessing and/or interacting with a web app often requires one of these
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Full or summarised text format published by a website that allows users to subscribe or follow a website without necessarily having to revisit the site to see the updated content.
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a webmail service from Microsoft.
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a service that painlessly synchronizes your files across any number of computers and even mobile devices.
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Hosting service for software projects using the Git revision control system.
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a free web service where people publish a weblog.
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One of productivity apps in Google Drive, that allows you to create and edit text documents
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User account needed to access services provided by Google
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Google's Contact Management service integrated into it's email service.
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For questions about Google Chrome insofar as they relate to interaction with web applications. Questions about Chrome settings or features should be asked at superuser.com.
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Pre-made or user-made sets of rules that perform different actions on incoming or outgoing emails in Gmail.
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Retired web-based RSS newsreader from Google from 2007 to July 1, 2013.
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Messages or alerts that let you know that an update, service change or some other activity has occurred
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Either of services which play, edit or record still images in successive motion or the transmission of such in real-time
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Generally refers to any email or message that is either unwanted or unsolicited. Often of a commercial nature.