I have seen plenty of Mac's getting "frozen" and directing you to call XYZ for support. It's just a script that runs when you hit an infected website. 9/10 times a reboot fixes it. Or you can get out of it with a force quit on the browser. Always makes me smile when it is the Microsoft one.
Never, ever, ever, call a number that pops up on your computer, no matter if you are on a Mac, PC, etc.
haha, first of all snopes is NEVER to be believed. they're biased liberals. anyway perhaps you're joking, but in all seriousness there's a whole lot of stuff missing from snopes, and their inability to tackle something doesn't make it any truer or not.