Social media is a giant cocktail party. I am not the first person to point this out, as the existence of this book would suggest (I haven't read it but since the author's title confirms my opinion, I am inclined to believe it's brilliant). I recently attended an interesting presentation at the Business Innovation Factory by Francois Gossieaux, author of The Hyper-Social Organization: Eclipse Your Competition by Leveraging Social Media. His main theme was that in order to successfully leverage web 2.0, you need to understand human 1.0. According to Gossieaux, businesses should worry less about what the latest and greatest technology can do and think more about the fundamental human behavior it can facilitate. He argues that humans are instinctively social creatures and the same basic principles apply online as they do in face-to-face interactions. I could not agree more. Yet so many social media marketing efforts ignore common courtesy and exhibit behavior you couldn't get away with at a cocktail party. I must admit I am guilty of committing some of these sins myself, but hey, we are all still learning the best way to play in the world of social media, aren't we? Here are 5 personality types that are sure to ruin the party.