The blog has moved to ShadowModeration.com.
This page remains in order to demonstrate that tweets mentioning CantSayAnything.win, a cheap domain I bought for $2/year, are automatically shadow-removed. For example, this tweet does not show the reply from me, even when you click the button “Show additional replies”. To see my reply, you have to access the link directly. Effectively, that reply is not visible to anyone who does not already know me, and the system conceals that fact from me while I am logged in.
To test it yourself, you can reply to me using this link. Your reply will not appear for others when viewing the parent tweet, you won't be notified of the removal, the parent tweet's author (me) won't see your reply, and your reply will still appear for you while you are logged in.