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When you add someone to a board they have to accept before seeing your cards. They will receive a notification that you have invited them, and you will receive a notification when they have accepted. Those invitations should also be in your board's history. You can change the settings of a board to only allow team admins to add members: Show menu > Settings ...


This is related to a feature called Twitter Cards. After the site owner inserts specific meta tags to the page and validates it via Twitter, a Twitter Card will be displayed in addition to the link. There are various card types for different types of content.

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