The 2010 movie "The Social Network" traces Harvard student Mark Zuckerberg's controversial launch of Facebook. It reveals the stress that the company's founding caused for everyone who had anything to do with it.

Fast-forward to 2015. Zuckerberg now has 43,325,923 Facebook followers and a multi-billion dollar company. But it's still stressful!

Your teenager isn’t close to having that many friends on Facebook, but he or she still may be dealing with the tension Facebook can trigger.

A new study from the University of Montreal looked at cortisol levels — which are a measure of stress — in teenagers who had 300 or more friends on Facebook. They found that the kids’ cortisol levels were consistently elevated.

Chronic high levels of cortisol are associated with everything from heart problems to depression.

The study's lead researcher cautions: "Adolescents who present high stress hormone levels do not become depressed immediately ... Some studies have shown that it may take 11 years before the onset of severe depression in children who consistently had high cortisol levels."

To ease stress, help your teen pare down their friends list. Chances are it contains people your teen barely knows and never interacts with. Then limit their time spent on Facebook to not more than 40 minutes daily.

If your teen dials down the intensity of the relationship with Facebook he or she will end up a winner.