Toy solutions solving Twitter’s “problems” are a favorite scalability trope. Everybody has this idea that Twitter is easy. With a little architectural hand waving we have a scalable Twitter, just that simple. Well, it’s not that simple as Raffi Krikorian, VP of Engineering at Twitter, describes in his superb and very detailed presentation on Timelines at Scale. If you want to know how Twitter work
![The Architecture Twitter Uses to Deal with 150M Active Users, 300K QPS, a 22 MB/S Firehose, and Send Tweets in Under 5 Seconds - High Scalability -](https://cdn-ak-scissors.b.st-hatena.com/image/square/058c46ee136eac9a6b131ca5b59db8f7f8502249/height=288;version=1;width=512/http%3A%2F%2Ffarm6.staticflickr.com%2F5481%2F9235686327_168142245c_m.jpg)