Misskey has that instance setting "integration" where you can apparently set up connections to Twitter, GitHub and Discord. Unfortunately, I have nearly no idea what this is needed or used for.
What I understood so far, these integrations are used for 'login with …'.
But is there anything else? Can you - for example - connect you Twitter account to use Misskey as Twitter client and import your Twitter timeline, interact with Tweets of your Twitter contacts and so on?