One of the most difficult things about tackling revenge porn is the sheer number of channels by which it is distributed.Despite high-profile convictions of site operators such as Kevin Bollaert, sent to jail in the US April 2015, most revenge porn sites are nowhere near as conspicuous, organised or open.
https://www.theguardian.com/technology/2016/may/09/revenge-porn-websites-legal-loopholes-anonymityAlso see:Revenge porn decision sparks anger at police
The mother of a 15-year-old victim of revenge porn has criticised police for letting the perpetrator off with a caution despite evidence he targeted five women over several months.
https://www.theguardian.com/technology/2016/may/08/revenge-porn-decision-sparks-anger-at-police