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Pinterest is like a corkboard you pin things to. What do you pin to it? Things you find on the internet. You can also upload your own materials to Pinterest (be careful; think about copyrights and permissions first).
Now, a revision: Pinterest is not a corkboard, but millions of corkboards. It's an extremely easy way to hang on to what you like, and let other people see it.
There's one board for every core standard in math, per grade level. Any of us can look at the boards. If you join Pinterest (see below) and send me your username you can pin to boards for your grade level. This is very, very easy to do (also see below).
The big idea? Let's heap all our ideas in one place so we can see what everyone has found.
First of all, the easiest way is to send Andy James an email and he'll take you through the whole process.
If you'd like to do this yourself, take these steps:
Create your account. Make a note of the username you came up with.
You'll have to go through a few pages of creating a starter board of your own, showing Pinterest what kinds of things you like, and so on. Just when you think you can't take it any more, you're done.
Now, send Andy James an email with your user name in it. He'll invite you to contribute to some of the math boards. He'll also send you all the bookmarks and show you how to add the "Pin It" button to your browser. (Notice the link is there in case you want to try it yourself.)