To gengo team and all who wanted to see the dropbox video:

As I am writing this post, the link to the dropbox video about gengo is not working. When visiting the link in the news feed, you are greeted with a 404 error page.
At first I thought it was simply because they hadn't uploaded the video yet, but after a quick check, I found that the link itself was simply missing one character.
Currently the linked url is: https://www.youtube.com/watchv=lalpezIggPE&list=PLr5Dz0J1etmqk4x8cJDJD1DQ4Sj_WFTW8
While the correct url is:     https://www.youtube.com/watch?v=lalpezIggPE&list=PLr5Dz0J1etmqk4x8cJDJD1DQ4Sj_WFTW8
A simple question mark was taken out, and made the url invalid.
Hope this helps.