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This jumped out at me, too. Here's how Unroll.me describes their service:

  Clean up your inbox
  Instantly see a list of all your subscription emails. 
  Unsubscribe easily from whatever you don’t want.

It's not clear at all that they are reading people's emails and selling the data.

Meta: it might be worth updating the title to mention this was published in 2011.

I agree. But as the article goes on to point out, we are not more trusting of complete strangers, but rather strangers who've been vetted by many AirBnb reviews, background checked by Uber, etc. Technology has changed the definition of a 'stranger'.

If the noise levels are too high, why not let the neighbors call it in? It seems like a waste of time to proactively try to find parties when they could just wait around at night for people to call in the noise violations.

The book touches on this. Basically, the human brain is biased towards novelty. It's much more likely to remember something if it's unique or interesting or different -- if it stands out.

The book's title, Moonwalking with Einstein, is one such example. Gordon Ramsey is probably another: there are lots of chefs out there, but if you see a chef screaming at people in his kitchen, it's probably going to stick with you, consciously or otherwise.

> Visa charges Square 1.76% + 6 cents

Last I checked, Square had not published the transaction fee they negotiated with Visa.