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BRIEF-Facebook's Sandberg says 'we didn't do enough'

March 21 (Reuters) - Facebook Inc Chief Operating Officer Sheryl Sandberg spoke for the first time about personal data that ended up in the hands of analytics firm Cambridge Analytica.

* COO SHERYL SANDBERG SAYS 'I DEEPLY REGRET THAT WE DIDN'T DO ENOUGH' ON CAMBRIDGE ANALYTICA -STATEMENT

* SANDBERG SAYS 'WE'VE SPENT THE PAST FEW DAYS WORKING TO GET A FULLER PICTURE' Further company coverage:

(Reporting By David Ingram)