1 Toy solutions solving Twitter’s “problems” are a favorite scalability trope.
2 Most people don’t use search so they can be efficient on how to store tweets for search.
3 Discovery is a customized search based on what they know about you.
트위터 반응

@xguru: 트위터의 1억5천만 액티브유저,300K QPS,22MB/S 파이어호스,일 4억트윗을 감당하는 아키텍쳐 http://t.co/lM8LYWsyud 타임라인과 Pull 기반 실시간 스트림 등.