Well i don't know if this idea has been shared before or not, but it bears repeating anyways. I actually almost fell for this myself. I received an email from someone claiming they were from an affiliate network and that they wanted to put ads on my site. They even had the company logo as the footer of the email so they looked legit. The kicker is they wern't actually a representative of said network. What they had done is sent me their affiliate link to that network. Tricky bastard. I was kinda flattered that a rep of a major network want to place ads on MY site, so i almost fell for it. So in a nutshell...find a competetors site. Look up their whois information and shoot them a legit looking email saying you are impressed by their site and and kiss their ass basically. My particular niche was movie websites. So if someone is using one content blocker network, sign up on a different one and send them an email saying they will have higher earnings with your network blah blah...you get the idea.