For new users:

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FAQ:
https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/FAQ.md

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Guide:
https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/User-guide.md

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Or just toot a question with #faq, #question, #metadon, or #support.

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We will get you set up in no time.