Great job! I really loved the incorporation of various multimedia technology and interaction. I also like the questions. I personally ended up learning quite a bit the Great Leap Forward and some it was renewed again! You chose a very timely and intersting topic give China being in the news on a daily basis. It will good to incorporate answeres in your questions, specially when it says "not true" this way the student understands where the mistake occured.
Not sure what is Diigo toolbar. You need to provide more information on this.