Algorithm Research

I need someone to do some research on comparison algorithms. How do the "Related Tags" on [login to view URL] work (for instance: [login to view URL])? And how do the "Related Clips" on Youtube work ([login to view URL])? What tags/clips are selected and how are they sorted? Finding the actual algorithms is of course probably impossible. But by examining the sites you should be able to make a list of important factors. ## Deliverables Text. (I expect something like this: [login to view URL] This concerns another algorithm, but it's similar to what I expect to get out from this project.) ## Platform NA