Where might you find recommendation engines at work? Suggesting a new song you might
enjoy on a streaming music site.
Providing new movies you might
enjoy based on titles you liked.
An online advertisement for a video
game you recently read about in a
blog post.
All of the above

All of the above.

Explanation:

All scenarios show signs of a recommendation engine at work since they are providing recommendations and suggestions of things that you would potentially like based on the analysis of data from your search history or likes from songs, movies, etc.

Hope this helps :)

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