There’s a little known trick you can use with nearly all email systems to create free alias addresses, and can help you track who is tracking you. If you add a plus symbol (“+”) and any text after it to the first part of your email address, messages sent to that address will still arrive in your regular inbox. For example, if your email address is ben@myemail.com, messages sent to ben+thisisatest@myemail.com will still work because the “+thisisatest” is ignored by email servers. Why is this useful? You can use these aliases to create a unique email address when signing up for accounts at various websites. For example, if you create a Facebook account using ben+facebook@myemail.com, you’ll still be able to receive email correspondence to your regular ben@myemail.com address. But if you then receive any junk messages sent to ben+facebook@myemail.com then you know with certainty that it was Facebook who sold your email address to that other company!