The world’s biggest social network is working out what steps to take should President Trump use its platform to dispute the vote.

SAN FRANCISCO — Facebook spent years preparing to ward off any tampering on its site ahead of November’s presidential election. Now the social network is getting ready in case President Trump interferes once the vote is over.

Employees at the Silicon Valley company are laying out contingency plans and walking through postelection scenarios that include attempts by Mr. Trump or his campaign to use the platform to delegitimize the results, people with knowledge of Facebook’s plans said.

Mike Isaac is a technology correspondent and the author of Super Pumped: The Battle for Uber, a NYT best-selling book on the dramatic rise and fall of the ride-hailing company. He regularly covers Facebook and Silicon Valley, and is based in The Times’s San Francisco bureau. @MikeIsaacFacebook

Sheera Frenkel covers cybersecurity from San Francisco. Previously, she spent over a decade in the Middle East as a foreign correspondent, reporting for BuzzFeed, NPR, The Times of London and McClatchy Newspapers. @sheeraf