Study: Twitter's uptime horrible in 2008, but improving
20/02/2009
The second half of the year was better than the first

Fuente: www.computerworld.com  Publicación: 19.02.2009

(IDG News Service) Microblogging phenomenon Twitter Inc., often criticized for its system's frequent outages, got its act together in the second half of 2008.

Although Twitter ended the year with an embarrassing 84 hours of downtime, it showed significant improvement starting in July, according to a study (download PDF) released this week by Pingdom AB, a Vasteras, Sweden-based Web monitoring company.
Twitter recorded 84% of its downtime in the first half of the year and finished 2008 with uptime of 99.04%, the worst among the 15 social networking services studied in the report.
"July and onward has seen a big improvement in site availability for Twitter," reads the report, titled "Social Network Downtime in 2008."
The social networks that came out on top in Pingdom's study -- Facebook, MySpace, Classmates.com and Xanga -- all had uptime above 99.9%. Imeem also finished in the top five, with uptime of better than 99.9%, but Pingdom did not begin monitoring it until May.
Rounding out the top 10 were Google's Orkut (11.2 hours), Last.fm (12.5 hours), LiveJournal (16.1 hours), Microsoft's Windows Live Spaces (17 hours) and Hi5 (22.1 hours).
AOL's Bebo ranked in 11th place, with 38.6 hours of downtime, followed by Reunion.com (41.9 hours), Friendster (43.8 hours), LinkedIn (45.8 hours) and, in last place, Twitter.
Reunion.com had the longest continuous outage of the sites studied, with an incident that kept it offline for almost 10 hours in late March, Pingdom said.
LinkedIn, a site for professional networking, saw its downtime steadily worsen as the year progressed, according to the report.
Pingdom tested each site's home page from multiple locations in Europe and North America every five minutes. It flagged a site as being down if, from at least two of its locations, it couldn't reach the site, the home page wouldn't load within 30 seconds, or the home page displayed an error message.

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