Poll

https://en.wikipedia.org/wiki/Category:Types_of_polling

1. https://www.polleverywhere.com/
2. http://www.poll-maker.com/
3. http://www.strawpoll.me/
4. http://pollkhol.net/
5. http://www.pollingreport.com/

Tube
https://www.youtube.com/results?search_query=Poll

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Poll