Here is some background on what I'm doing so that you guys can advise me best as how to proceed. I have launched a specialty digital product selling site (I'll divulge URL via PM) which is trying to attract vendors. There's no cost to them as we're 100% ad supported. So I've harvested over 20,000 URLs of the vendors' websites from competing selling sites with the thought of grabbing as many email addresses as I can get from them NOT TO SPAM but to plug into Facebook Custom Audiences and start serving them highly targeted ads. This 20,000+ list is a treasure trove and I'm sure that there are more, as well as more effective, ways to drive them to sign up at my site than just plunking FB ads in their faces. So any suggestions would be welcomed! BTW, I put this in BH SEO for lack of any other more suitable forum. I'm emphatically not interested in SEO in this project, just want to reach these 20,000+ vendors with specific messaging as to the unique features of my site.