Personnally i think that facebook and other social networks are worth nothing. They send bad quality visitors. People who never click on affiliate links, never click on ads, never buy anything. I also started by spending lots of time on social networks and i discovered it was a complete waste of time.
You can find free adult directories like mine for instance. There are other ones.
like purebizness, xlinklist, pornsubmits and also link exchange systems like linkspun.
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