Chemical Reasons Behind Facebook Addiction !

The study says: "Statistical analysis of the psychophysiological data and pupil dilation indicates that the Facebook experience was significantly different from stress and relaxation on many linear and spectral indices of somatic activity. Moreover, the biological signals revealed that Facebook use can evoke a psychophysiological state characterized by high positive valence and high arousal."

It added that it's possible users reach a "positive affective state" when they access their social networks.

The report comes the same week that a University of Chicago study found Facebook can bemore addictive than cigarettes or alcohol.

With Facebook boasting 845 million users and Twitter at around 300 million, this research could be part of the reason for their enormous numbers. In fact, the researchers indicated that people seek out sites like Facebook and Twitter to receive this type of satisfaction, which has in turn, boosted their growth.

There's been no shortage of Facebook studies lately. Another report released last week found that those with a low self-esteem could suffer more by using the site, as posting negative items to Facebook often makes them appear less likable to their friends.