Well, I've done a little looking around and here's what I've found:
It's not just us. The Cracked website is also saying they've had the problem. It seems to stem from a specific ad provider.
It only seems to affect the Google Chrome browser.
If you are having the problem, got to your settings in Google Chrome and click on "Extensions." Look for any extensions that may be there that you haven't downloaded yourself. That may indicate that you have the problem. Delete them, and that should clear up the problem.