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OAuth 2 is way simpler but requires HTTPS, which may have overhead at scale.

Everything has overhead at scale. I think the 'HTTPS is hard on computers' stage has passed by though...its just not that computationally intensive on modern hardware.

Obligatory reference: "SSL/TLS is not computationally expensive any more."

http://www.imperialviolet.org/2010/06/25/overclocking-ssl.ht...

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