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Nice to see that a web.py site will be Twitter's search partner. Looking forward on how they will scale it. webpy.org

I'm sure this service is not a web.py project. Yandex uses its own home-grown technologies for projects like this.

Web.py is probably used mostly for intranet services.

As far as I know, their search engine does not use webpy. May be they use it for other parts of portal though.