Rainbird: The Way Twitter Counts Tweets In Realtime (Which Will Be Open Sourced) Yesterday, Twitter analytics lead, Kevin Weil, gave a talk at O’Reilly’s Strata 2011, a conference dedicated to big data. The main topic of the talk was Rainbird, Twitter’s realtime counting system that’s built on top of Cassandra. Notably, it powers a number of things Twitter uses internally, such as Promoted Product