Learnist is a new site (still in beta) that aims to be like Pinterest but for sharing learning resources. On Learnist you can create pinboards of materials organized around a topic. You can create multiple boards within your account and make your boards collaborative. You can pin images, videos, and text to your boards by using the Leanist bookmarklet, by manually entering the URL of a resource, or by uploading materials to your boards. Take a look at the video below for a brief introduction to Learnist.
Applications for Education
Learnist is still in a closed beta period so you will have to apply for an invitation (I got mine in a few days). Once you're in you can start following members of your professional learning community and collaborating on the collation of resources that are beneficial to you and your students.