That guy isn't a Ruby developer -at- Facebook; he writes Facebook Platform apps in Ruby. With that being said I'm sure there's something in Ruby somewhere at Facebook - in an organization that size, there's room for a lot of best tools for the job.
Plus, Ruby is big in the CM/operations/deployment world given the popularity of both Puppet and Chef.
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They do. See the comment on this answer on SO: http://stackoverflow.com/a/553455
That guy isn't a Ruby developer -at- Facebook; he writes Facebook Platform apps in Ruby. With that being said I'm sure there's something in Ruby somewhere at Facebook - in an organization that size, there's room for a lot of best tools for the job.
Plus, Ruby is big in the CM/operations/deployment world given the popularity of both Puppet and Chef.