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Using the Google Accounts Authentication API https://www.google.com/accounts/authsub/terms.html

Accounts Authentication API - Terms and Conditions

http://info.yahoo.com/legal/us/yahoo/api/api-2140.html

Terms Center

Thank you for using the Yahoo! application programming interfaces (the "Yahoo!

Facebook

http://www.facebook.com/apps/site_scraping_tos_terms.php 1. These terms govern your collection of data from Facebook through automated means, such as through harvesting bots, robots, spiders, or scrapers ("Automated Data Collection"), as well as your use of that data. 2.

Application Integration Points - Développeurs Facebook

http://developers.facebook.com/docs/guides/policy/application_integration_points/ Introduction: Stream Stories Stream stories must accurately represent interesting actions users have performed or content they want to share. Users should never be surprised by the publication of a story on their behalf, or by its content or timing. Platform Policy IV.1 You must not incentivize users to use (or gate content behind the use of) Facebook social channels, or imply that an incentive is directly tied to the use of our channels.