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"What technology has twitter invented?"

http://twitter.github.io/ currently lists 101 public repositories. Highlights include a SPDY library for iOS, Zipkin (a distributed tracing system), flockdb (a distributed, fault-tolerant graph database), Finagle (their own highly concurrent RPC system)... a TON of stuff.

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No offence meant but that is like saying "Kia is also a car, does the same work. Why the hell even BMW exists"

May be BMW is doing things on the back that make it a better choice. Same is the difference between twitter and its thousand clones.

Do you have any idea the amount of engineering effort required to handle the scale of Twitter's service?

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