Facebook CEO Mark Zuckerberg is admitting mistakes and outlining steps to protect user data in light of privacy scandal involving a Trump-connected data-mining firm.

Zuckerberg is breaking more than four days of silence as he posts an update about the Cambridge Analytica scandal.

Zuckerberg posted on his Facebook page Wednesday that Facebook has a "responsibility" to protect its users' data, and "if we can't then we don't deserve to serve you."

Zuckerberg and Facebook's No. 2 executive, Sheryl Sandberg, have been quiet since news broke Friday that Cambridge may have used data improperly obtained from roughly 50 million Facebook users to try to sway elections.

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Kenya's opposition says lawyers are poring through a British broadcaster's investigation to see whether legal action is possible against data analytics firm Cambridge Analytica over its role in the country's disputed presidential election last year.

Cambridge Analytica already is being investigated by British and U.S. authorities over allegations the firm stole data from 50 million Facebook users and used it to manipulate elections.

National Super Alliance Chief Executive Norman Magaya says a legal team will look into whether Cambridge Analytica was involved in what Kenya's opposition claims is a hack of the electoral commission and manipulation of results in favor of President Uhuru Kenyatta.

In the Channel 4 report this week based on undercover video, Cambridge Analytica took credit for stage-managing Kenyatta's campaign. It denied any involvement in inflammatory videos targeting Kenyatta's opponents. There was no discussion of mining Facebook data.