Marshall Kirkpatrick serves up an at-a-glance view of the top five social networking platforms, including Google's new Android and the content storage model of Box.net, and also provides a brief description of each one and how they benefit developers. His quick chart could also serve as the basis for future platform comparisons and analysis, helpful since it is likely that new players will continue to enter the space and Webmasters will need to evaluate which ones to open their site to.