Most of us are using Web2.0 sites but massive user base that logins every second is a big challenge to system performance. Let’s see how engineers working for MySpace, Facebook and Twitter are doing their job.
Note: all uptime buttons and images below are generated in real-time, you can click on images / baners to see reports with details directly from site-uptime.net.
MySpace
MySpace uptime
Facebook uptime
Twitter uptime
As you can see the “winner” in this category is: Twitter! 
Site-uptime.net
site-uptime.net is a service that continuously monitors websites and allows to configure email / SMS notifications on downtime. May be helpful for professionals who care about accessibility and uptime of their services.
Yeah, saw quite a few fail-whales in the last few days. API isn’t working too well either. Maybe Twitter should drop Ruby and use a proper technology like PHP
Comment by Michał — 20/05/2010 @
I appreciate their (Twitter team) efforts and their optimisation task size (enormous hit count per second) but it seems the variance is high from few months not days. Looks like Ruby-based architecture optimisation wasn’t a simple task.
Comment by dariusz.cieslak — 20/05/2010 @