The Wayback Machine - https://web.archive.org/web/20110916183119/http://support.twitter.com/
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Twitter basics
Getting started, account settings, following, searching, Facebook integration...
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Something's not working
Can't login, email confirmation, missing Tweets, following problems, search failures...
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Report a violation
Hacked accounts, reporting spam, trademark violations, impersonation, safety...
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Apps, SMS, and Mobile
Connecting your mobile, SMS/text messaging, official Twitter apps, troubleshooting...
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Advertising
Getting started, Promoted Products, Tutorials for existing advertisers...
