600,000 Facebook users unknowingly take part in psychological experiment
Research suggests that there are at least two kinds of active Facebook users:

1. people who are higher in attachment anxiety.
2. people who are higher in extroversion.

People who were higher in attachment anxiety exhibited greater amounts of what the study refers to as "feedback seeking" on Facebook.

"Compared to more secure people, those higher in attachment anxiety are more feedback sensitive," said Joshua Hart, -ociate professor of psychology and the lead author from New York based Union College.

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