All Twitter is blocked with a message "This web site contains restricted content. Access to this type of content has been blocked "
I am using Mac OS Mojave 10.14.2
Have you tried to change the virtual location?
I found similar thread for the same issue.
We have a Sample Analysis Department (SAS) to help verify the blocking URL. Kindly send these samples for verification to our SAS team. They will then liaise the issue with you directly. You can submit a sample URL here.