I just finished a personal programing project that enables content creators to offer free content in exchange for one or more friend referalls through Facebook, Twitter or G+. It's a bit like "pay with a tweet" but consumers have to send a private message with the content link attached instead of publicly tweeting or liking. I am looking for some feedback from you guys. The website is up and running at microsmiles. It's a free service and i started making it with musicians in mind but it supports all kinds of content. I am really looking forward to making it available to the public. Thanks in advance!