Hundreds of Twitter accounts were reportedly hijacked to deliver a wave of malicious messages.
The attack, which seems to have begun at about 2 p.m. PT on Wednesday, featured messages testifying to dramatic weight loss and life-changing events.
According to CNET, an accompanying link led to a Women's Health magazine spoof site promoting a 'miracle pill' for weight loss.
It is not immediately clear if the page was trying to install malware or perform some other nefarious task.
The attack appears similar to one that hit thousands of Hootsuite accounts last September and featured the same diet product, the report said.
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