"Fix: easy - don't use Twitter." Externalities are a problem still. When you're a truck driver and your employer gets 100 angry emails and phone calls because

"Fix: easy - don't use Twitter." Externalities are a problem still. When you're a truck driver and your employer gets 100 angry emails and phone calls because someone tweeted a picture of you doing an "OK sign" to a passing motorist, then you lose your job, not being on Twitter wasn't an option.