What technique would you use to find similar people with the same social profile as you? (computer science)

Let's take your Facebook social profile. There are interests, activities, movies, music, and tv-shows.

You have these 5 things, in text, of course. Given your social profile and 10 other people, we want to find overlaps, similarity, etc. What method would you use to do it?

I"m guessing it would be best to use vectors and Euclidean/Pearson correlation? That's my approac开发者_Python百科h. What's yours?

Please use a visual-style to answer this question, including examples and/or drawing out the vectors.

The December ACM student magazine discussed this area.

http://mags.acm.org/crossroads/2009winter/