Facebook May Have Once Used Coldfusion
Although Facebook is commonly identified as a PHP site there exists an archived version of Facebook's home page built with Coldfusion: https://web.archive.org/web/20120620044923/http://www.facebook.com/index.cfm . Ph.D researcher and Coldfusion consultant Karl Simanonok also remembers seeing index.cfm in the address bar when analysing an early version of Facebook around late 2004/early 2005 and recognised use of the Fusebox framework which he had used in his consulting work.
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[ 3.3 ms ] story [ 39.2 ms ] threadThe initial proof-of-concept was coded in around 10 days and then they got stuck with it for a while until they moved to .NET ~2005
https://www.forbes.com/sites/stephenwunker/2011/07/25/4-mora...
[1] https://web.archive.org/web/20120801000000*/http://www.faceb... [2] https://web.archive.org/web/20120801000000*/http://www.faceb...
MySpace was in Coldfusion, I'm pretty sure, so maybe they were playing with that at some point.