Here are some additional resources from my #ConfusedMom talk today:
Should I Friend or Follow my Teen on Social Media?
13 Tips for Monitoring Teens’ Social Media
https://www.commonsensemedia.org/social-media/age/teens/
http://www.pewinternet.org/2015/04/09/teens-social-media-technology-2015/
http://www.pewinternet.org/2013/05/21/teens-social-media-and-privacy/
https://www.gaggle.net/top-social-networking-sites-and-apps-teens-use/