Today I learned about eduClipper. It's like Pinterest but you can use it with your students (Pinterest requires that its users be 13 years or older, as do most sites where you need to create an account.)
So just like pinning content, here you clip it. You can clip from Microsoft docs, webpages, Google docs, YouTube, etc. You can also create boards by using the little plus sign on the left. And you can create classes where you and your students can share ideas. You always have the option to be in full control of a board if you don't want your students to alter the content.
Try it out and post ideas about how you might use it in your classroom.