In a paper published by the IEEE Computer Society, the researchers say how quickly, how far and when we walk -- and if we pick up our phones during the night -- reveals telling patterns. By correlating physical activity to personality traits, the team determined that "agreeable" people have random activity patterns and are busier on weekends and weekday evenings. Sensitive females apparently check their phones regularly and well into the night, but sensitive males do the opposite. And more inventive and curious people make and receive fewer phone calls compared to others.

The researchers say this data could be used to better inform social media friend recommendations, online dating matches and targeted advertising. They also suggest it might help us better understand ourselves -- you can decide how depressing that sentiment is. There are some holes in the study, like the fact that it only sampled 52 people. It's also based on personality surveys, and people tend to be pretty bad at answering questions about themselves. The researchers plan to replicate the study in Australia to confirm their theories. Regardless of the outcome, you can be sure companies will use accelerometers to gather user data in one way or another.