Final answer:
Foursquare is a mobile-driven social networking platform that focuses on user interactions with real-world locations, offering a way for businesses to connect with consumers through location-based marketing (option A).
Step-by-step explanation:
The question is asking to identify what Foursquare is from the provided options. Foursquare is a location-based social networking platform. Users can use Foursquare to check in at various locations, earn badges, and leave tips for other users. It also allows businesses to connect with customers by offering specials to users who check in at their location.
Social networks like FB similarly allow users to share details of their day and businesses to promote their products, but Foursquare focuses specifically on real-world locations and user interactions with those places. Therefore, Foursquare can be best described as a mobile-driven social networking process that harnesses user location data to cater experiences and advertising. It doesn't strictly fit the description of a shared promotional campaign, legitimize advertising content, or describe a set of key objectives in a marketing campaign.
Hence, the answer is option A.