Please see this page for the official mastodon.social content and moderation policies. The page keeps up-to-date counts of the total number of users, posts, and connected instances, as well as a run-down of mastodon.social's content moderation policies. It also includes descriptions of the types of content that aren't allowed on mastodon.social and what kinds of actions may be taken against you for violating these policies.
However, please note that if you join an instance other than mastodon.social, but that also utilizes Mastodon software, that instance's moderation policies may be different. For information on an individual instance's policies, you will need to check with an instance mod, or check their front page.
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