Former Twitter employees said Jack Dorsey ignored the warnings given since 2015.
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The hack on Twitter two weeks ago that injured more than 130 accounts of personalities like Bill Gates or Barack Obama was avoided, employees said.
The warning was directed to Jack Dorsey, the company’s co-founder and other managers, five years ago and last year, said four former employees and employees close to Twitter.
They informed Bloomberg that security personnel have since taken the risk of not applying controls to the staff of 1,500 employees who access tools to manage user accounts.
Requests to security personnel were pushed aside to prioritize other internal projects to increase sales.