The committee is likely to discuss antitrust probes of the four companies under way at the Justice Department and Federal Trade Commission, as well as allegations that the companies seek to thwart nascent competitors.
Democrats, in particular, are expected to press Facebook about a proposed $5 billion settlement between the company and the FTC to resolve allegations that the company violated a 2011 consent agreement by inappropriately sharing information on 87 million users with the now-defunct British political consulting firm Cambridge Analytica.
Facebook is likely to note it has increased spending on security and moderating content to keep hate speech and disturbing videos off of the site.
Other congressional panels Tuesday will focus on Facebook's plans to bring out a cryptocurrency, the Libra, and allegations that Google is biased against conservatives in search results.
The companies are expected to argue that they face plenty of competition and that consumers have alternate choices for search, social media, online purchasing and wireless devices.
Witnesses include Google's Adam Cohen, director of economic policy; Nate Sutton, an associate general counsel at Amazon; Matt Perault, head of global policy development at Facebook and Apple's Kyle Andeer, a vice president and chief compliance officer.
While the tech companies appear to have few friends on Capitol Hill, there has been some pushback from Republicans against a proposal by Senator Elizabeth Warren, who is running for president, that Amazon, Facebook and Google be forced to divest companies that they purchased previously.
"I don't think the goal of antitrust law is to break up a big company just because they're big," said Representative Kelly Armstrong, a Republican from North Dakota, on Fox Television. "I don't ever want to penalize any company for success."