If only they had been examining James Holmes’ tweets and postings before the shooting. And had body scanners at the movie theater. And armed guards. Armed movie goers! Ah, totalitarianism…. Do it for the children.

People’s nasty traits have a way of revealing themselves on social networks: in writing. Or rather in how they write. That means an analysis of how someone tweets could reveal whether he or she is narcissistic, Machiavellian, or psychopathic, according to researchers who plan to present their findings at DefCon next week.

What are some of the Twitter stylings of these undesirables? Curse words. Angry responses to other people, including swearing and use of the word “hate.” Using the word “we.” Using periods. Using filler words such as “blah” and “I mean” and “um.”