Top Definition
The all-consuming, incomprehensible rage old rich people get when talking how about much Facebook is worth because of how silly they think it is. Specifically applies to the very rich who might invest in it. The Wall Street Journal publishes front-page stories on Facebook stock price while it puts normal company prices in the back, which aggravates the disease.
My boss heard Facebook's janitor bought a new Ferrari and he jumped out the window. Facebook Derangement Syndrome (FDS) fatality number 489.
by Tederator March 04, 2011

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