Wiktionary
a. (context chiefly journalism and blogging English) Related to a very small area, smaller than normally considered local.
Wikipedia
Hyperlocal connotes information oriented around a well-defined community with its primary focus directed toward the concerns of the population in that community. The term can be used as a noun in isolation or as a modifier of some other term (e.g. news). When used in isolation it refers to the emergent ecology of data (including textual content), aggregators, publication mechanism and user interactions and behaviors which centre on a resident of a location and the business of being a resident. More recently, the term hyperlocal has become synonymous with the combined use of applications on mobile devices and GPS technology. Use of the term originated in 1991, in reference to local television news content.