Twittervision - "A medical condition where one can only read the first 140 characters. Remaining characters turn red."
Term coined by jcruz and Calestus on twitter.
Dear John, I found someone new and I don't think we can go on seeing each other, I've taken you for all your worth and emptied the humidor,
The rest of the reply is red and since you are color blind, unreadable. Twittervision.