Also, be aware that:
You are not Facebook's customer. You are the product they sell to their customers, which are advertisers. This rule applies to almost all free online services.
Google is best understood as an advertising agency.
The Edward Snowden NSA revelations suggest an almost unfathomable scope of online spying.
"The reality is if you're on the internet, you literally might as well be on the front page of the Globe and Mail" - John Adams, former chief of the Communications Security Establishment of Canada
For a student-created resource: http://digitaltattoo.ubc.ca/protect/