The list you mention was included in a mass-mail that Tumblr sent out yesterday to users that had interacted with any of those accounts (I know because like the

The list you mention was included in a mass-mail that Tumblr sent out yesterday to users that had interacted with any of those accounts (I know because like the author of the particle post we are commenting on, I too received the email; unlike the original poster, I cannot remember which of these ’blacklisted’ accounts I had interacted with).