Kvidre rapporter vanskeligheder for abonnenter at forsøge at bruge netværk via webstedet - Bloomberg

Biz Stone, co-founder of Twitter Inc., photographer: Jacob Kepler/Bloomberg

Twitter Inc., service social network that allows users to share 140 characters messages, said it is seeing an increase in the error rate, which makes it more difficult to gain access to the site.

"We are aware of the problem and take action," said San Francisco-based company today at about 3 p.m. New York time on a blog devoted to the site's status.

Twitter has struggled with service disruptions, such as its traffic surges. The average number of postings are sent daily increased to around 140 million in the past month, from 50 million a year earlier, the company said this week. Twitter had reported "increased error rate" a further four times in February, along with a number of other difficulties.

The company increasingly rely on its Web site to deliver advertising, potentially putting more revenue at stake, when the service goes down. Kvidres rising prospects and potential ad revenue has helped drive up its valuation. It was valued at 3.7 billion dollars in December when it received investment led by venture capital firm Kleiner Perkins Caufield and Byers. That compares with $ 1 billion in September 2009, according to a person familiar with the matter.

Carolyn Penner, a spokeswoman for Twitter, refused to comment beyond what was on the status blog.

Contact the reporter on this story: Brian Womack in San Francisco at bwomack1@bloomberg.net

Contact the person responsible for this story editor: Tom Giles at tgiles5@bloomberg.net.

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