here are some links with helpful suggestions:
http://www.ajc.com/lifestyle/experts-dont-be-parent-866187.html
http://www.surfnetparents.com/three_common_worries_of_teenagers_today-21430.html
http://paramus.patch.com/articles/is-your-teen-in-the-throes-of-teen-angst-or-depression
an article on why teens are drawn to social media:
http://kidslearntoblog.com/why-teenagers-love-social-media/
And new research showing that just as teens encounter more peer pressure, their brains become more able to resist bad behavior choices: