So for some reason, someone blocks you on Twitter, whether it was due to an argument or harassment. It just happened. What happens when you get blocked? You won’t be able to see each other’s tweets; you’ll unfollow each other; if they try to view your profile, they’ll see they’ve been blocked; and they can’t direct message (DM) you. And on top of that, all your past DMs will be erased. So, if you need those as evidence, you better start taking those screenshots now.
Source: Lifehacker