Google Spaces is a platform on which you can create small communities of friends and colleagues in which you share links, notes, and pictures. A Google Spaces Chrome extension makes it easy to share links with people in your Space. I created a couple of communities this morning. You can learn how to create a Google Spaces community by watching my video embedded below.
Applications for Education
Google Spaces could be a good tool to use to create a small community of friends and colleagues to build discussions around shared resources. I can also see potential for using Google Spaces as a place in which you host online discussions for high school and college students taking one of your courses.