WASHINGTON — President Donald Trump signed an executive order targeting social media companies Thursday, but despite a lengthy Oval Office diatribe, it’s not clear whether it will actually do anything.

“It isn’t going to meaningfully change anything, and I think it’s not serious,” Sarah Miller, executive director of the American Economic Liberties Project, an anti-monopoly think tank, told BuzzFeed News.

But Miller said a “much more important and serious” conversation was going on elsewhere in the government: how to use antitrust laws to rein in big tech companies.

Federal regulators mostly sat back as companies like Google and Facebook gobbled up competitors and grew into massive platforms. But now a growing number of lawmakers from both parties are arguing that these platforms have become akin to public utilities that need oversight — or something more drastic.