You can spot a narcissist by how often he or she tweets.

A report in the journal Computers in Human Behavior shows people with more narcissistic tendencies tweet more often than others. Narcissists are also heavier Facebook users, but on Facebook they can get friends by simply requesting them.

However, on Twitter they have to get more followers by sending out as many interesting or funny tweets as they can in a bid to fill their need for attention and affirmation.

Comparing the two platforms, the researchers found that narcissistic college students prefer to post on Twitter, while narcissistic adults like to post more on Facebook.

--Rob Archer