From Twitter’s Official Blog (By the way, why does Twitter have an official blog? I thought blogs had been outdated by Twitter’s ability to turn blog posts into the much more convenient format of 73 numbered Tweets in a row?):
Setting the record straight on shadow banning
By Vijaya Gadde and Kayvon Beykpour
Thursday, 26 July 2018
People are asking us if we shadow ban. We do not. But let’s start with, “what is shadow banning?”
The best definition we found is this: deliberately making someone’s content undiscoverable to everyone except the person who posted it, unbeknownst to the original poster.
We do not shadow ban. You are always able to see the tweets from accounts you follow (although you may have to do more work to find them, like go directly to their profile).
So that’s that. Twitter does not shadow ban. (Instead, Twitter shadow shades. Or something/)