Crowdsourcing practical sessions in a university course focusing on social media?

I’ve been teaching medical students about using social media for years at two medical schools and through a digital format as well. These courses consisted of series of extended Prezi.com lectures, written exam and constant online communication with students discussing their questions on Facebook and a blog.

The challenge I face now it that I try to include more practical sessions (tasks they have to do online after each lecture) in the course, and I’m wondering what these may be. Any suggestions?

The Social MEDia Course main page