There are millions upon millions of blogs available today, and many of them are hosted on dedicated blogging services. These kinds of services have been around for a long time, with pioneers like Blogger paving the way for WordPress.com and more recent arrivals like Tumblr.

One of the main benefits of using a blogging service is that they make blogging easy. There’s no need to deal with traditional hosting. You blog, the blogging service keeps your content available online.

In theory, blogging services should also be able to make your blog more reliable since they have a lot of servers at their disposal, often spread across multiple data centers. If your blog gets flooded by traffic (usually a good thing), a blogging service has a much better chance handling it since your traffic is just a drop in the ocean for them. Had you been on a single server (or even a shared one), your site might not have coped.

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The blog search engine Technorati suffered from both downtime and slowdown during large periods of December 12 and 13. In those two days, the Technorati website was completely unavailable for a total of more than 9 hours.

There are indications that the problems may have been caused by database issues at Technorati.

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The recent world-wide financial chaos has reminded us how sensitive the stock market is, with sharp up- and downturns. Now imagine the reaction of the stock traders if they couldn’t trade at all. It doesn’t happen very often, but it does happen.

Stock exchanges usually have strict SLAs and high demands on availability, but they can’t completely avoid downtime. We have gathered up some of the major stock exchange outages that have occurred so far this decade (i.e. since 2000 and onward) and listed when and why they happened.

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