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Airbnb is still on rails.. Probably the largest rails app out there for now.

Except that I'd bet Airbnb's read qps requirement is less than 1% of Twitter's. Write qps would be even smaller.

True, but on an absolute scale AirBNB is still very big.

By RPS, I imagined Shopify is largest. But then from what I understand, Shopify operate in such a way that every shop is its own app. i.e there is 100s of thousands of Basecamp / AirBnb running on the same code base and every shop is somewhat isolated.

Purely in terms of App in think the largest would be Cookpad. AirBnB never shared their numbers so I don't know.

https://speakerdeck.com/a_matsuda/the-recipe-for-the-worlds-...

I don't think so. Seriously think about it. How many active users does AirBnB have? How many put their home up for rent, and how many rent in a year? I reckon you get more tweets in a day than AirBnB rentals in a year. That's how big Twitter is or small AirBnB is. :D

Twitter was bigger but they don’t run on Rails anymore where I gather AirBNB does.

I would imagine Shopify on Black Friday is under heavier load.

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