In what ways are brands using Instagram to communicate with consumers in today’s digital age?

Current research lacks critical depth and needs the inclusion of digital marketing books/journals.
ideally i’d like the dissertation to be structured as follows..
Introduction
Case study 1
case study 2
case study 3
conclusion
the marking criteria includes
Definition of a valid subject of individual interest and pertinence.
evidence of an appropriate level of ambition
thoroughness of research
understanding of the material consulted and of the methods of interpretation and analysis employed.
critical engagement