There is such a thing as too many friends: Having more than 300 friends on FB increased cortisol levels in teenagers, but engaging in supportive behaviour such as liking and posting positive messages can decrease stress levels.
According to a recent Canadian study, having more than 300 friends on Facebook can have a negative effect on a teenager's level of the stress hormone cortisol.
However 'liking' on Facebook, and posting positive comments and messages to friends can have a positive effect.
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