Here are links to some videos, I have used in my classes previously.
Steve Jobs address to graduates--- www.youtube.com/watch?u=UF8uR6Z6K1c
Young Girl givng speech at the UN- www.youtube.com/watch?u=d1I6ljzY9K.
These are discussion starters. As to the dropbox, I cannot reveal the access codes, but we use dropboxes extensively for debate. We share all argument files using that method, and I can even download and grade assignments by using the dropbox.