I think the reason kid's (including myself) don't log on to facebook much anymore is because for one thing it's been quite popular for quite some time. And another theory is that it is because of all the newer social networks that are available now. (Twitter, Instagram, Vine, Tumblr) etc. Most of these newer sites allow you to do more than facebook and of course are more popular because it's new (kind of how facebook was at first.) Every website out there goes through a faze where it is popular for a short time until something much better comes out and then the whole cycle starts all over again.