The article "Regulating Over-the-Top Service Providers in Two-Sided Content Markets: Insights from the Economic Literature" by Prof. Dr. Jan Krämer and Michael Wohlfarth recently published in the journal "Communications & Strategies".
The paper develops a framework to classify "Over-The-Top Services" (OTTs) and afterwards discusses ramifications stemming from a (potential) regulation of these services. The latest working paper version is accessible at SSRN: http://ssrn.com/abstract=2674081.