Pinterst????

     Because I don't like to spend a lot of time on the Internet, and I am actually trying to wean myself even further off things like Facebook, I'm having a hard time catching on to this new Pinterest website. What exactly is the point of the website it's self? I have the "Pin It" button on top of my navigation bar and I have randomly "pinned" a few things that I have seen off of Facebook, but really what is this all about?
     Am I missing the boat? Am I missing the point? Am I just not trendy enough to keep up? What is it? Am I just supposed to accumulate "Pins" of things that just interest me? Things I want to do, make, places I want to go? Am I supposed to share those same things with others? What am I to do with all of my Pins?
     OK, well if anyone can enlighten me, I would really appreciate it.