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Hmm, the #2 Facebook Auto-Follow hack is interesting.

I wonder if any users had a friend follow them, then mention it to them in person and have the other person be like "Oh...I never followed you."

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Yes, this definitely happened. Several of us were looking at Pinterest's signup flow and how their site enabled viral features. I was the first to sign up and then my co-founder signed up later in the day, _specifically_ choosing not to follow anyone during the on boarding process. I received an e-mail from Pinterest that he was following me, then he received an e-mail that I was following him. Neither was the case.

Isn't this unethical?

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