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Netherlands-based website monitoring company WatchMouse has created a public website dedicated to measuring performance at social networking sites including Facebook, Twitter, Foursquare, LinkedIn, Del.icio.us, Digg, Xanga and Flickr.

WatchMouse also release uptime statistics for the top 20 social sites for the month of August. The leaders were Orkut, which had no downtime, Flickr with just four minutes of downtime, Del.icio.us with 12 minutes of downtime and the gaming site hi5 with 32 minutes of downtime.

Twitter went down last week. So did Facebook, LiveJournal, and Blogger.

They were all victims of a denial of service attack that was, depending on who you believe, either the work of Russian nationalist hackers targeting a Georgian economist, a clever ploy by the United Economists of Georgia to garner sympathy by feigning an attack by Russian nationalist hackers, or an attempt by Paramount Pictures to divert attention from reviews of G.I. Joe: The Rise of Cobra.