How virals spread

Spanish scientists have researched how memes spread across the web. It depends upon how "infectious" people are, how quickly virals spread and from this: who gets the viral and how infectious they are.

Read more:
http://www.newscientist.com/article/dn17581-infectious-people-spread-memes-across-the-web.html

Defining viral

Asking some questions about what counts as viral. Were the BBC cheating?

http://www.bbc.co.uk/blogs/technology/2009/03/this_is_a_viral_blog.html