HOW TO SPY ON A FRIEND OR ENEMY

Wildstrom, Stephen (2005) Leaky websites tell all about you BUSINESS WEEK, 6/6, 28.

If you want to know what others are doing, you just get their e-mail and start applying for various websites. The websites that say “thank you for reconfirming your membership” or something like that will tell you that the person goes to that site.

It takes a long time, but it gets you the information. It is also legal.

Now is it moral?