Previous research has shown that basic demographic information (such as age, gender, and education level) can be guessed by looking at online profiles. But a new study goes much farther, documenting clues for intelligence, sexual orientation, and drug use.
We've all got them, no matter how left or right you lean. They're the Facebook friends who can't post a single status update without making it political, or who seem to share every last bit of oversimplified propaganda they come across.