From the Washington Post's "Facebook, Google chiefs open to testifying to Congress on antitrust, while Apple’s participation remains unclear" posted Tuesday:
Facebook CEO Mark Zuckerberg and Google CEO Sundar Pichai signaled they are open to testifying to Congress as part of lawmakers’ ongoing antitrust probe into the tech industry, while Apple has not yet explicitly agreed to send its leader...
In letters to committee leaders, Facebook and Google signaled they would dispatch their top executives as long as other tech giants’ leaders participate, the sources said. Amazon chief executive Jeff Bezos also has signaled he will participate in the hearing, after the e-commerce giant initially resisted lawmakers’ demands, The Post reported this week. Bezos owns The Washington Post.
Apple, meanwhile, told the committee that it would send a senior executive yet did not clearly commit its leader, Tim Cook, to appearing before lawmakers, according to one of the people with knowledge of the matter. That approach could ratchet up tensions between the iPhone giant and lawmakers in Washington, who previously had threatened to issue a subpoena forcing Bezos to appear before Amazon ultimately expressed an openness to it.
My take: Cook will do the right thing. That's how he rolls.