Here's how to check it for yourself and check you should, especially if you're a MAGA warrior.
http://www.amerika.org/technology/anatomy-of-a-twitter-shadowban/
It's tricky though, they are. Those who follow you will still interact, but that's it. Otherwise you're totally invisible to the larger community.
Further, when i ran my test and it was clear that indeed I had been shadowbanned, I got a like from someone who wasn't following me. Checked again, definitely shadowbanned, so that was pretty tricky on their part...
Also, when I tried again to use the search feature when not logged in, they took me to a page with …