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Mark Zuckerberg in his own words:

It's hard to quantify that because this isn't a short-term thing. If an event [like] this happens and our users get spammed then they trust the site less and they use it less, then that could affect us tremendously down the line, even if it doesn't affect it right at this point.

No, that's not the Facebook founder's mea culpa on the much-derided Beacon advertising program. It's Zuckerberg's deposition account of rival network ConnectU's attempts to harvest emails from Facebook profiles. But Zuckerberg's claim that the impact of losing user trust is "immeasurable" is just as apropos today as it was three years ago.