At a meeting of the National Speakers Association and in a session about the advantages of all the social media sites. The main ones to be on are linkedin, facebook, youtube, twitter and blogs. You should really have accounts on all of those sites and have a blog. Why? You can use these sites for many busiuness reasons: First, it allows you to create an on line dialog with people you want to network with. It allows you to get feedback on ideas. It's becoming a great marketing tool. And you can use these sites to do research. Finally, when your blog is connected to your web site and you blog regularly, it increases your google ranking. So go for it.