For basic security, instances will employ transport-layer encryption, keeping your connection to the server you’ve chosen private. This will keep your communications safe from local eavesdroppers using your same WiFi connection, but it does not protect your communications, including your direct messages, from the server or instance you’ve chosen—or, if you’re messaging someone from a different instance, the server they’ve chosen. This includes the moderators and administrators of those instances, as well. Just like Twitter or Instagram, your posts and direct messages are accessible by those running the services. But unlike Twitter or Instagram, you have the choice in what server or instance you trust with your communications. . . . Two-factor authentication with an app or security key is available on Mastodon instances, giving users an extra security check to log on. The software also offers robust privacy controls: allowing users to set up automatic deletion of old posts, set personalized keyword filters, approve followers, and hide your social graph (the list of your followers and those you follow). Unfortunately, there is no analogue to making your account "private. . . . Mastodon users can mute, block, or report other users. Muting and blocking works just as you’d expect: it’s a list associated with your account that just stops the content of that user from appearing in your feed and prevents them from reaching out to you, respectively."
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