You can check the Social Science Research Network's paper list for the category you need, for example, search for 'Digital Marketing' or 'Facebook and Company Performance'. Find the link here: https://www.ssrn.com/en/
To be relevant with the global challenging economy, the tremendous effect of globalisation, unpredictable consumers' expectation and the intensity of market competitions, I suggest you to focus more on the sustainability of SMEs in facing uncertainties. A model that explains and provides solution is badly needed by SMEs. Why? Many successful SMEs have failed to survive during the economic uncertainties.