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https://www.facebook.com/careers/department.php?dept=enginee...

(A Facebook job advert for Kernel Engineers.)

See also: https://github.com/facebook/flashcache/ - a write back persistent block cache for Linux, written by some of the Kernel Engineers at Facebook.

(I work there.)

I can't speak for Zynga or LinkedIn, but if you think Facebook runs on a stock kernel without a lot of internal tweaks you are sadly mistaken. If you are a hard-core kernel hacker looking for a new job then Facebook would love to chat...

Are you saying that Facebook, Zynga, and LinkedIn are the only employers? In the future all restaurants are Taco Bell.