ShadowDrive is a web application that plans to make sharing content more social through various social networks. It is still in development and plans are in place to have desktop, tablet, and mobile services available in October of 2013. You can currently join for free by logging in through Facebook (Twitter in the future). You can still use the service, but the space allotment is currently small, just 1GB. What makes it worthwhile is that students probably won't be using a large amount of space in the first place.
With integration into Facebook, ShadowDrive would make it easy for students or teachers to have important files or documents easily made available to students and have it appear on their Facebook Timeline. We are well aware that students are on Facebook. Now, if you have a teacher page or classroom page you can have files made available to students. Students that are working together on a project could also use the service to share pieces of a project, artifacts, pictures, videos, etc.
Another benefit is that if your Facebook friends are using the App, then they would have access to the same files through the ShadowDrive site. There are several security features in place to not only protect privacy, but also to protect the legality issues that might surface. Like other applications on Facebook, you do have to provide permission to this App.
Here is a video that introduces the product and provides more information. If you are an active user of social media (Facebook and Twitter) in your classrooms with your students, this might be an app worth investigating.
To learn more here are some other reviews of interest: