Republicans raised long-running conservative grievances, unproven, that the platforms are biased against conservative viewpoints and censor material based on political or religious viewpoints.
There is increasing support in Congress for legislation to rein in Big Tech companies.
The tech CEOs defended the legal shield under Section 230, saying it has helped make the internet the forum of free expression that it is today.
Trump enjoyed special treatment on Facebook and Twitter until January, despite spreading misinformation, pushing false claims of voting fraud, and promulgating hate.
The tech blog Gizmodo eventually revealed the device was a “BlockClock” that shows the latest prices of cryptocurrencies like bitcoin and ethereum.