as with social networks themselves, anything else worth doing at scale of the Internet, and to paraphrase the lead character in the cult classic series Highlander  [10], ultimately " There can be only one! " -Mike Schinkel [1] http://www.dogster.com [2] http://vampirefreaks.com [3] http://www.meetup.com [4] http://www.paperbackswap.com [5] http://en.wikipedia.org/wiki/Clark_Howard [6] http://www.hosting-netexplorers.co.uk/web_hosting_uk/content_management_systems/ mambo_vs_joomla.php [7]