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Re:The Architecture Twitter Uses to Deal with 150M Active Users by Myrmornis on Tuesday July 09, 2013 @05:04AM (#6011749)
Title? Link doesn't work.
Re:The Architecture Twitter Uses to Deal with 150M Active Users by harryh on Tuesday July 09, 2013 @10:35AM (#6012859)
Huh, weird. Works fine for me. Anyways:

Feeding Frenzy: Selectively Materializing Users’ Event Feeds Authors: Silberstein, A.; Terrace, J.; Cooper, B.F.; Ramakrishnan, R.

A quick Google should turn it up for you somewhere.