[kinkrtyavimoodh]

> Not even Facebook has sold my e-mail address.

Won't FB be among those least likely to sell your email address? FB has tons of ways to make money using your data. Your email address offers very low marginal utility over all the rest of your data.

[sleepychu]

FYI you've used marginal utility incorrectly in this context. I think it would be better to say a low return.

"thus the marginal utility of a good or service is the change in the utility from an increase in the consumption of that good or service." [1]

[1] - https://en.wikipedia.org/wiki/Marginal_utility

[ComodoHacker]

Facebook would rather BUY users' e-mail addresses in bulk.