This paper establishes inadequacies of the Unified Theory of Acceptance and Use of Technology (UTAUT) theory to explain social media adoption by microbusinesses. Literature review confirms the explaining power of UTAUT in variety of technology adoption by businesses. This paper uses UTAUT theory to implement social media technology in microbusinesses. Canonical action research method is adopted to introduce social media in microbusinesses. A post positivist approach is used to report the results based on a predetermined premise. It was found that the major constructs of performance and effort expectancy played insignificant role in establishing behavioural and adoption intention of social media by microbusinesses. Social influence and facilitating condition did not influence the behavioural intentions of the microbusiness owners. Individual characteristics and codification effort dominated the use behaviour. Goal of gaining customers leads to behavioural modification resulting in replacing of behavioural intention with goals as a superior method of predicting adoption behaviour within the context of microbusinesses. This paper extends the UTAUT to explain social media adoption in microbusinesses.