However I am not convinced that teens are quitting the largest social networking site - for several reasons. Sure they have Twitter, Instagram, Whatsapp, SnapChat and others - but none will give you the functionality that Facebook has.
I believe teens (and tweens - since we know that minors are also on Facebook) are likely creating fictitious profiles on Facebook.
How would a parent know and why is it important to know?
Safety reasons obviously. As a parent it is your responsibility to monitor your child's digital life. Especially if their off-line behavior starts acting suspicious (withdrawn, secretive, changing friends, etc) you need to be aware of what is going on with them so you are able to help.
Recently I wrote an article in Huffington Post Parents with tips to see if your teen has a fake profile on Facebook. Read more and pass it on to a friend with kids.
Be an educated parent, you will have safer teens! On and off-line.
