This is a completely new "thing" for me, and I kind of liked it. I think it is an interesting tool to work with the students in the classroom. It allows everybody, even the shy ones, to express themselves.
I liked the Multimedia Venn Diagram because it was made mainly by students. You can use it with many different topics, since Venn Diagrams are very often used as graphic organizers.
I can think of using Voicethread in the classroom for a Writing lesson, kind of a Writing chain, where every student adds a new sentence and all together create a cool story!!