Twitter is back up after more than an hour of service interruption. The company just posted an update in its status blog indicating that users can now tweet freely. 
"Update: The issue has been resolved and all services are currently operational," the status reads. 
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Still no word on what caused the outage. A Twitter spokesperson said earlier that the company is looking into it, but did not say when the service may be back up. 
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Twitter appeared to be completely down starting 9 a.m. PT, according to monitoring site Down Right Now, but some users seemed to be able to access it as of 10 a.m. PT though not consistently. 
"Users may be experiencing issues accessing Twitter. Our engineers are currently working to resolve the issue," the Twitter's status blog posted early. 
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According to the stats on Pingdom, this looks to be Twitter's worst crash in months. We'll update as we get more information.