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Including dozens of AWS and Azure services, container orchestrations like Docker and Kubernetes, and more 

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Pinpoint the root cause down to a poor-performing line of code

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Microsoft’s social network clocking the most downtime

Social networks are more popular than ever, and are flourishing in the Web 2.0 era. With their huge user numbers, it is very important for these websites to have a high availability. For the largest social networks, a broken website usually means closing the door on millions of people.

To see how reliable they are, we took 12 of the largest social network sites in the world and tested their availability (uptime) over a one-month period. The included sites were MySpace, Facebook, LiveJournal, Orkut, Friendster, Windows Live Spaces, Xanga, Bebo,,, and Yahoo! 360.

Windows Live Spaces (formerly known as MSN Spaces), Microsoft’s social network with an estimated 27 million unique visitors per month, finished last in the test with a total of three hours of downtime. The majority of that downtime occurred during US daytime on October 19 (a Friday), so it must have affected a very large amount of users.

In contrast, Yahoo’s old initiative in the social network arena, Yahoo! 360⁰ (which looks like it will be to be replaced with Yahoo! Mash during 2008) came out on top with zero downtime, while the two social network giants MySpace and Facebook (both fighting for supremacy) only had 10 minutes of downtime each during the same period.

Downtime for social network home pages Oct 19 – Nov 19, 2007
Social Network Home page Downtime
Yahoo! 360 0m
Facebook 10m
MySpace 10m
Bebo 30m 35m
LiveJournal 40m 1h 10m
Orkut 1h 25m 1h 40m
Friendster 1h 50m
Xanga 2h 10m
Windows Live Spaces 3h 0m

Social networks, by their very nature, have users who are very active and visit the site frequently, generating a lot of page views. This makes any downtime more noticeable, since it means a larger loss of page views than for a “normal” site (view an older article expanding on this). In the Windows Live Spaces example, three hours may not sound like all that much over a month, but it is three hours of lost page views and ad exposure that Microsoft will never get back.


The survey measured the home pages of the 12 included social network sites from October 19 to November 19, 2007. If a home page did not respond within 30 seconds, or gave an error back, it was counted as down.

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