The video was made by EA Barcelona. Perhaps @Melanie Brennan can say more about that?

One vote per charity and device will be counted. So everyone can vote for all EA charities. :)

Thanks for asking! The videos about GiveWell should be about GiveWell itself (as an organization). And should solicit donations for the (evaluation) work of GiveWell. Then there should be no problem. If you (also) want to make a video for a GiveWell-recommended charity, you can make a video for the Against Malaria Foundation. :)

Yes, changed it. Sorry, don't know how the link could be wrong...

Changed it. Thank you!