(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 were all invited but won’t attend the public conference at Stanford University, according to the companies. Apple Inc. CEO Tim Cook is planning to show to the event, where Obama is scheduled to give the keynote speech and have a private lunch with a select group of attendees.

The technology industry had been a vital source of political support, campaign contributions and assistance in developing cutting-edge tech tactics for Obama when he won the presidency in 2008 and re-election in 2012. Relations have soured since, as the companies have clashed with the Obama administration over government spying and protecting the privacy rights of their users and customers.

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