You'll find the same thing in any area where people are passionate.
Anything negative about apple (and their products) will do something similar, especially if you talk about how whacked a one-button mouse is.
Also, so called meta-posts about social network sites. My post on DZone about DZone is the top for the last 30 days and in the top ten for the last year (it wasn't meant as link bait but, as a real discussion).
Looking at Digg, the most popular posts tend to be about digg itself.
Politics is another big area where this happens but, more hit or miss.
BTW, you don't have to defrag your hard drive with Linux, the file system is more intelligent 
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