When a website ends up denied (saturated with external communications requests, such that it cannot respond to legitimate traffic, or responds so slowly as to be rendered effectively unavailable) due to a sudden enormous spike in popularity.
A Social Network Denial-of-Service (SNDoS) could be started by one Facebook user setting his/her wall status to: "Go to urbandictionary.com, type in your first name, copy and paste this as your status and the First entry for your name under comments"
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