• blocks (or any social action) should be able to be private. (encrypted to yourself, also to a recipient, or public)

It should be possible to block or follow or like without advertising that. You may want to let someone know that you followed them, but not let someone know that you blocked them. when following a block list, you may not want everyone (potential trolls) to know you did that, but you may want the maintainer of that list to know