No, I'm just kidding. Pinterest is awesome!
I'm a very visual person. When I want a river to be in my story I find pictures, using Google Images, that speak to my story, print them out and staple them in my world building journal. I can now use Pinterest instead. No wasted toner, no wasted paper. Since there's an app for that, I can look at the pictures whenever I need them. I'm also using it to collect covers of Dark Fantasy books. Already, I'm noticing a trend. Big plus, I can link it with Facebook and Twitter so I don't need to remember another password!