(Bloomberg) -- The top executives of Google Inc., Yahoo! Inc. and Facebook Inc. won’t attend President Barack Obama’s cybersecurity summit on Friday, at a time when relations between the White House and Silicon Valley have frayed over privacy issues.

Facebook Chairman and Chief Executive Officer Mark Zuckerberg, Yahoo CEO Marissa Mayer, and Google’s Larry Page and Eric Schmidt all were invited but won’t attend the public conference at Stanford University, according to the companies. Apple Inc. CEO Tim Cook is planning to be at the event, where Obama is scheduled to give the keynote speech and have a private lunch with a select group of attendees.

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