This assumes that someone creates a free and easy to use front end that has these filters. I can believe that. This also assumes that a large fraction of Twitt

This assumes that someone creates a free and easy to use front end that has these filters. I can believe that. This also assumes that a large fraction of Twitter users would use such filters. What makes you think they will? The reason I have doubts is that people who tend to be influenced by evil Twitter posts are not the type of people who are amazingly self aware and look for ways to reduce that influence.