Location-Based Campaigns. Instagram's geo-tagging feature allows users to post photos marked with their location. Brands can use this to promote its own whereabouts -- for example, a special brand event with exclusive photos of guests and speakers, or a sampling station that invites consumers to come try out a new product at a designated spot. Brands can also use the geo-tagging feature to create a scavenger hunt that calls on users to find location-specific items and tag them for a chance to win prizes.