If I get any unwanted popups, should I change all of my passwords?

Hi! I recently got an unwanted popup in Facebook, directly after clicking to "like" a message I'd listened to in YouTube that seemed to be ok. But I later found he was a crook and had suspicious-looking pictures surrounding his Youtube message box. I had ignored them in the big hurry I was at the time. But then, I saw those same suspicious pictures in ads - showing up in Facebook directly afterwards. So I did all I could think of to remove it and keep it from posting again. In Facebook settings, I said to to prevent all ads from showing. I think this may have removed the problem. But now, I'm afraid he might have my password, as I know of no other way he could have known how to post his ad on my Facebook page as a popup kind of ad. So should I be concerned? Should I change all of my email passwords and Facebook password now to protect me from theft, etc.? Thanks.

I see a 'theme' in most of your posts in the various forum topics here. My personal advice, based on this 'theme', is to turn off your internet and all your concerns are over. As to this specific issue, I violently suggest you change ALL of your passwords AND, if you plan on continuing to roam the internet, change ALL of your passwords on a more than regular basis.