Which of the following is NOT a platform mentioned for SEM?

The choice that highlights a platform not associated with Search Engine Marketing (SEM) is Facebook Ads. SEM primarily involves paid advertising that appears on search engine results pages and is designed to target users based on their searches. Google AdWords and Bing Ads are two major players in the SEM space as they allow advertisers to bid on keywords and place ads that show up in search engine results when those keywords are searched. YouTube Search Ads are also closely related because YouTube is owned by Google, and video ads can appear in response to specific search queries made on the platform.

In contrast, Facebook Ads operates on a different model, targeting users based on their interests, behaviors, and demographics rather than on search intents. This platform doesn’t capitalize on search queries but instead focuses on the social context of its users. Hence, it does not fall under the category of SEM, which makes it the correct answer for the question posed.