"YouTube co-founder Jawed Karim on How YouTube Got Viral.
1) related video recommendations
2) one-click emailing to spam a friend about a video
3) more social networking and user interaction tools like video comments
4) an external video player
Re: #4, the external video player did have an amazing impact. In a matter of months, YouTube seemed to go from nowhere to everywhere due to that slick and easy to embed player."
Tuesday, November 21, 2006
How YouTube Got Viral
Play buttons and YouTube's interface - (37signals):