The Global Social Media Network has a comprehensive list of damn near all the social media sites and the sites with social media tools and, woah! That's a big list. This is a Swiss Army Knife of access to places where you can drop a few links and a few lines of your best content. Remember though, this isn't about places to do free advertising. Inbound media is about speaking to the buyer's interests. Be funny, be cool and, most of all, be knowledgeable about what the buyer wants to read about. Read the comments, think about what people are saying. Do you have anything to say? Most likely you do, and being opinionated is a good thing when it comes to the Internet. Then let her rip -someone out there in "The Tubes" will share your position.