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"ads not by Facebook" or more generally "ads not by this site" is a strong indication that your computer is under an Adware attack. This kind of Adware hijacks your browser in order to alter the content of the web pages you see by adding advertisements without your permission and without the permission of the website you are visiting. To be fair, these Adwares do actually get your permission in one way or another, but they do it in a very subtle way so that you won't even remember when and how it happened. For example, when you install an extension/add-on/plugin/toolbar for Chrome or Firefox, you are willingly giving control to that extension over the contents of the pages you visit. Some extensions take advantage of this trust and start putting their own ads to generate revenue. These ads will get very annoying as you start seeing more and more of them on your Facebook timeline or on YouTube - especially when they include content you don't approve of such as gambling ads, adult content, and money scams. If you have kids using the computer, the problem becomes even more serious, because such ads cannot be easily moderated.
So what do you do about this?
You simply need to remove the extensions that cause these ads to display. After all, this is a breach of trust. In my humble opinion, a self-respecting extension provider should make it very clear to you (before you even install the extension) that the extension intends to generate revenue through putting ads on your browser. But if they don't make that clear, then maybe they are also doing more malicious activities in your computer such as stealing information and logging your browsing or keyboard activities. You never know.
Some advertisers will be gracious enough to let you know that their extension is the reason you are seeing the ad. In this case, all you have to do is go to the settings of your web browser and remove the extension.
(Tip for Chrome users: type this into the URL field chrome://settings/extensions)
However, in many cases, you have no idea where the ad is coming from. Your best bet in this case is to actually do a trial and error experiment until you find the extension. That is, remove one extension at a time, restart your browser, and go to the page that displayed the malicious ads previously. If the ads persist, then the extension you just removed is not the source of the problem. If the ads are gone, then you're good! From my own experience, after a number of trials, I found that the extension that spammed my browser with all kinds of ads was "Media plugin" - version 2.0.
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