I think the world is crying out for a mashup of Google Mail Goggles and StupidFilter. Google Mail Goggles is an optional feature for Gmail that will present you with math problems to make sure you think before sending an email when you’re inebriated. StupidFilter analyzes text for “stupidity.”
Wouldn’t it be great if Web browsers and email clients had a tool that could assess the stupidity of text to be posted and then present math problems scaled in difficulty to the degree of stupidity. Thoughtful comment on the status of a project at work? You get 2 + 2. Forwarding an email your crazy uncle sent you about Barack Obama being a Muslim? You get this.