Checked it out, but found it very saturated with crap and naked people. It was so bad I question the value of such a site. I signed up, selected the categories I'm interested in and it made me a follower of some other "pinners"--my home page resembled nothing I was interested in. Maybe it is because I'm a guy, and there are no guys on there. My verdict: Pintrest is out of control and without focus. Businesses are hungry to exploit it and the Pintrest people are desperately looking for a way to make money off it.
My wife has mentioned it is a great place for recipes, but she likes looking at food for some reason.