The following is taken from Get Paid University.

How come it’s hard for the people to refer if you don’t give them something to refer. If you give them a business card, maybe they’ll carry it around long enough to hand it to somebody. But if you send them an email with something valuable, how easy is it for them to forward it to their friends? Or they’re going to post a link to it on Facebook or Twitter. I’m getting… on my blog, I’ll put up a blog article and I found a plug-in that puts a Twitter button and a Facebook button and I’m noticing I’m showing up on Twitter with people saying check out this article. I didn’t even know that was going to happen.