Who’s in Town
Who’s in Town uses information that is already public; Instagram users have to opt-in to sharing their location and geotags with followers. The longer you’ve been using Instagram and sharing your geotags, the more data the app can pull.
The app has two viewing modes: General and Single User. General shows you a map of all of the people you follow. Single User lets you hone into a single individual. According to the app’s creator, it’s mean to be creepy. It’s a way for people to learn just how much their data reveals.
People don’t realize what they’re sharing. They’re [operating under] the false assumption that this information is only going to a few people … but it’s public.
An Instagram spokesperson said the company is reviewing Who’s in Town to make sure it doesn’t violate its policies.