Radius Targeting

In Advertising, Radius Targeting is basically a sub-set of geo targeting. It allows you to specify area/city and its surrounding hoods. Currently, Fb offers radius targeting for up to 50 miles around a certain geo area. This geographic targeting is useful for local businesses. The next step (if you find 50 miles insufficient distance) is to target by state. The difference wouldn't be that great. There may be only 1% to 5% more potential customers, in which case you better chose to advertise to the entire state/province.