Since some people may get past our screen locks, a second line of defense against undue embarrassment is required. One such bulwark is Google Chrome’s Incognito mode, or private browsing.

The internet is full of tips and tricks on how to make it cheaper. One of the most pervasive “tricks” is to use incognito mode when searching for your flights to get a cheaper ticket.

To illustrate this point, Google recently agreed to purge billions of records containing personal information collected from people using incognito mode to surf the internet as part of a ...