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Berkeley is an inner-ring suburb of St. Louis, located in St. Louis County, Missouri, United States. Area: 4.97 mi
Clayton is a city in and the seat of St. Louis County, Missouri. It borders the city of St. Louis. Area: 2.51 mi

Curious, does Facebook have the ability to pinpoint two small close locations? 
Curious, does Facebook use IP address or GPS coordinates? 

How can Facebook detect my location?
Here are three ways Facebook tracks your location: Location services – This involves your phone or tablet's GPS coordinates, as well as Wi-Fi and cellular network locations. ... It's been confirmed that Facebook will estimate your location using your IP address, even if you opt out of location tracking.

Does Facebook track IP addresses?
Facebook confirmed to Gizmodo that it's tracking users by collecting IP addresses as well as data from check-ins and other content. ... We do use IP and other information such as check-ins and current city from your profile. We explain this to people, including in our Privacy Basics site and on the About Facebook Ads site.

Facebook reveals it can track users location even if they turn off location services
Facebook says that it tracks a user's whereabouts to serve advertisements in the News Feeds, customize products and services like accurate weather forecasts, offers from Marketplace and to let people learn about the presence of their friends close by via the Nearby Friends feature.

The company details three ways in which it receives location information of users-- when a user enables location services voluntarily, through checking-in and tagging posts and pictures on Facebook and finally, from IP addresses. The latter two methods of obtaining location data are in fact said to be a "rough" estimate, unlike the accurate information Facebook gets when a user opts-in for location tracking.

Facebook says that "Even if someone does not enable Location Services, Facebook may still understand information about their location based on information that they and others provide through their activities and connections on our services."

Facebook claims that they typically only get a rough location information of users who have opted-out of the Location Tracking service and is limited to city/zip codes and location derived from IP addresses. However, its still a user's location information which they've voluntarily turned off, to which the company has access to because they have to display ads in News Feeds.

source: Google