If you're like me and you lurve to learn and read then this is for you. Best of all it is free. Coursera offers a wide range of courses from different universities. Like regular courses, you sign up and have tasks to complete. I can't wait until they add a social media course.
Then there is MIT which offers over 1800 courses and yes they are free. They have a plethora of topics that are arranged by department. You could spend hours browsing through all of the courses.
If you are still not sure people are talking about when they speak of pinning, tweeting and writing on a wall, then this is for you. GCS Learn Free has all of the social media basics.