"Putting ads there is exactly the same as putting ads into your newsfeed, " she explained.

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When your friend "likes" Wiggins Widgets' new TV advert, that is likely to pop up in your newsfeed.

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So, by replacing the keywords that the the extension is looking for in your newsfeed and changing the RSS feed(s) that it pulls the replacement images from, you can essentially hack the incoming images in your Facebook feed anyway you want.

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Except maybe finding out via your Facebook newsfeed that your college ex is dating someone from your fraternity.

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So, the feature in the upper right-hand corner of the newsfeed now shares what your friends are listening to or watching.

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