One of the hottest topics in the online world in the last couple of years has been the growth of social networking services such as Facebook and MySpace, as well as the addition of a social element to existing user experiences. Despite riding several waves of hype, its now clear that the social networking space will only get hotter in 2008 according to most watchers. Social software has come fully into its own as of 2008 -- for all appearances permanently -- and understanding the r