A nice way to enhance project-based learning, and PicMark lets you share on several common social websites such as Google+, Twitter, and Fb.
"PicMark is a simple tool that allows you to brand your pictures with a custom frame before you post them online. Adding a mark is as simple as uploading your picture to their site, choosing a frame, and sharing it to Facebook, Twitter, or Pinterest. The site allows you to further enhance your frames by choosing colors, styles, and typing messages on the frame. If you'd like, you can even design your own custom frame to use anytime. PicMark is great for teachers to share class pictures on their class web page or with students in projects. PicMark is free to join and it makes sharing pictures just a little bit more fun."
Does a lot of what Google Docs does. Share and edit a text together with others. Good for collaborative writing. The interface may be easier for younger learners.