Last week Twitter was the 27th most visited website in the UK, one place above MySpace, according to the research company.
In Hitwise's social network category, Twitter ranked fourth behind Facebook, YouTube and Bebo and one place above News Corp's social network.
Yet the figures represent only part of Twitter's success as millions of people access Twitter accounts through their mobile phones and through apps such as TweetDeck and Twitterific.
As well as displaying the remarkable growth of Twitter, the statistics show a drastic decline in MySpace's populariy in relation to rival social neworks.
MySpace recently cut back on its global operations after admitting that its expansion plans were too ambitious. Meanwhile Twitter has yet to set up offices outside the US.
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