If you're a Twitter user, you've probably wondered how seemingly irrelevant hashtags make it to the top of the Trending Topics list. How could #meowmonday be so popular? (Especially when #nopantstuesday is less than 24 hours away!). A few days ago I came across this interesting illustration outlining the 'anatomy of hashtag meme relevance over time':

Twitter Trending Topics

Image Credit: Meg Pickard, @megpickard, meish.org

The graph is an informal analysis based on the observations of Meg Pickard, who heads up social media at The Guardian. Meg's blog is highly recommended.

This post originally appeared on May 21, 2009 at Wikinomics.com.