> Almost all Wikipedia articles are within 4 hops of each other.
Neat fact, do you happen to have the source? I'd be interested in hearing more on this.
I couldn't find anything definitive, but here are some papers on the topic:
http://mint.typepad.com/mypapers/pp017-lizorkin.pdf
http://www.fran.it/articles/wikimania_bellomi_bonato.pdf
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=arnumber=4...
Almost all Wikipedia articles are within 4 hops of each other. You can open as many tabs as you like, but now you have the choice.