I'd love to get your feedback on this for ideas. I have an eBook which I used to give away as an incentive for signing up for my email list, now since I revamped and added a lot more content to it (it's almost 100 pages now) I want to give it away in exchange for some social proof, namely Facebook likes, Twitter followers, and YouTube subscribers.
Ideally I'd get people to give me all three but I recognize that some people might not have accounts on Facebook, Twitter, etc.
Furthermore I want to get proof that I have received the social proof before sending out the book. Any recommendations on any of this would be greatly appreciated.