Re: Well-said, Simon
"(to put it simply, every Facebook and Google icon you see on a web page can be a spy)"
Semi-false: _Is_ a spy as the icon almost never appears by itself, there's always a spy script attached to it, fetched directly from FB/Google site.
Sole intention is to spy on you _on whatever page you are on_.
Both FB and Google even create phantom user accounts to track those people who don't have an account. Whatever to collect data to sell.