There’s no end-to-end encryption on either platform’s private messaging at the moment, and to be fair there isn’t for Twitter or Facebook either (though Facebook is rumored to be looking into it for their Messenger). Both Mastodon and Diaspora are built on the idea that the conversations happening are meant to be public, so the privacy emphasis is on keeping user data in user ownership and out of advertiser’s hands, not keeping conversations out of the public eye.
Add Friends – Players can request friends by targeting them in game and confirming the request. The friend display name will always be the name of the character that created the friendship. Characters have a context menu option to refuse friend requests. Players can have up to 50 friends at a time. There is a 30 second delay between sending friend requests.