Social Down Or Not – Social Availability
http://social.downornot.com/

This real-time status report measures the uptime of the most popular social networks and is provided by WatchMouse. This site can be used to see if a particular social network is down or if it is loading slowly. This site also provides social network up- or down-time and performance history. Every five minutes each social network is checked from one of the 49 WatchMouse global monitoring stations. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Social Informatics Subject Tracer™.