Twitter experienced approximately 98% uptime in 2007, or about six full days of downtime.[45] Twitter's downtime was particularly noticeable during events popular with the technology industry, such as the 2008 Macworld Conference & Expo keynote address.[46][47] During May 2008 Twitter's new engineering team implemented necessary architectural changes to deal with the scale of growth. Stability issues resulted in down time or temporary feature removal.
In August 2008, Twitter withdrew free SMS services to users in the United Kingdom[48] and, for approximately five months, instant messaging support via aJabber bot was listed as being "temporarily unavailable".[49] On October 10, 2008, Twitter's status blog announced that instant messaging (IM) service was no longer a temporary outage and needed to be revamped. Twitter aims to return its IM service at some point, but says this requires major work to be completed.[50]
When Twitter experiences an outage, users see the "fail whale" error message created by Australian artist and designer Yiying Lu,[51] a whimsical illustration of red birds using nets to hoist a whale from the ocean.[52] The message reads: "Too many tweets! Please wait a moment and try again."[52]
On 12 June 2009, in what was called a potential "Twitpocalypse", the unique identifier associated with each tweet exceeded 2147483647, the limit for 32-bit signed integers. While Twitter itself was not affected, some third-party clients were, and had to be patched.[53]
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