I volunteer at our local library with the computer classes. One upcoming class is on Pinterest and Flickr. I used to use flickr, so I have some knowledge of it and understand its' purpose (although I use facebook and youtube to share photos now...) Anyway, I checked out pinterest once and thought it looked boring and not useful. Now that there's a class coming up where I'm helping the library, I checked out pinterest at wikipedia and looked at the site again. Again, I don't get it. It seems like picture-sharing, but it seems very limited compared to facebook (and flickr). So what am I missing? What's the appeal/worthiness of pinterest?