Foursquare CEO Dennis Crowley, quoted in Why Do People Keep Giving Foursquare Money?:
Knowing what places you’ve been inside of no longer requires you to actually check into places in the app… We have ‘Big Data’ about where people go, where they go after they go there, where they went before, where they don’t go anymore—there is tremendous value in all that check-in data. It is our job to harvest that.
Evernote CEO Phil Libin, quoted in Seven Questions for Evernote CEO Phil Libin:
There are bright lines that we won’t cross. We wouldn’t do anything where we’re seen as trying to make money from people’s information. Not that there is anything inherently wrong with that, but to us it violates trust. Anything you put into Evernote is private, and it’s yours.
And here’s a prescient talk (pre-NSA revelations) by security expert Bruce Schneier explaining how private companies know more about us than the government, and the risks of that.