There is a facebook group that promises some special abilities but it’s actually a bit of a scam. The group is called:
NOW YOU CAN SEE EVERY 1 WHO VIEWS YOUR PROFILE
Apart from the annoying all-caps writing, the group suggests you install a toolbar to make this possible.
You should never install toolbars unless you completely trust the company who made it and really need it. In this case, Facebook didn’t make the toolbar. A stranger did. And you don’t really need it (and it doesn’t do what’s promised).
So do people fall for these things? I looked at this group in Facebook and 146,604 have joined it. That’s a lot of gullible people who don’t understand how Facebook’s privacy works.
There isn’t much information on what the toolbar actually does but it seems to spam your friends. Spamming is not nice (and possibly illegal in some places).