The committee announced on Wednesday that it has issued subpoenas to Sundar Pichai, CEO of Alphabet, the parent company of Google, the nation’s largest search engine.

The committee is also trying to compel cooperation from Andy Jassy, the CEO of Amazon, the nation’s largest retailer. The committee sent a subpoena to Mark Zuckberg, the CEO of Meta, the parent company of the social media giant Facebook.

“In contrast to Meta, Twitter recently set a benchmark for how transparent Big Tech companies can be about interactions with government over censorship,” the letter from Jordan to Zuckerberg says. “The Twitter Files have exposed how Big Tech and the federal government have worked hand in hand in ways that undermine First Amendment principles. Numerous internal documents from Twitter reflect the weaponization of the federal government’s power to censor speech online. It is necessary for Congress to gauge the extent to which this occurred at Meta as well.”

[That’s a friendly warning — either duplicate Musk’s version of transparency, or get ready for a big subpoena fight that will make Zuckerberg look like he’s hiding something. — Ed]