Hi, I knew recently there is a conference calls for the addict of internet in general( https://internetandtechaa.wordpress.com/ ) but I didnt find yet the same thing for the persons addict to masturbation and pornography. I think they are more people involved in the nofap, than in stopping wasting time in internet, so maybe conferences between nofappers exist, but I don't know where is it...
There is SAA, Sexaholics anonymous, porn addiction is classified under sex addiction so you can try looking for that.