Organizers said protests would take place in all three locations on Tuesday as Zuckerberg testifies in the House.
Under the heading "Defend Facebook" were the words, "If attacked: Respectfully, I reject that".
Kennedy asked Zuckerberg if Facebook can give users "a greater right to erase" and share data, to which Zuckerberg replied that Facebook already gives those rights to users.
Since the scandal broke, Zuckerberg has made multiple apologies, and changed the way third-party apps operate with the platform.
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Police responded to a call that there were shooters in a gold Honda Accord firing at a blue Dodge Challenger, police said. Defence lawyer Nathan Bourke acknowledged Gwatkin's driving had been "appalling".
Michigan Senator Gary Peters asked Zuckerberg about whether Facebook uses smartphones' microphones to listen in on private conversations to which Zuckerberg curtly replied "no".
In February, U.S. Special Counsel Robert Mueller charged 13 Russians and 3 Russian companies with interfering in the election by sowing discord on social media.
He said the Russian campaign of disinformation had been discovered "right around the time" of the USA presidential election, and said the company had developed "new AI tools" to identify fake accounts responsible. "2018 is an important year for the whole world".
"That's really Facebook's bread and butter, this is where they make their money", he said.
Facebook wants to protect the integrity of the process and they have deleted thousands accounts that could exploit internet systems and affect elections, he said.
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At the heart of the hearings were the recent revelations that data from as many as 87 million users wound up in the hands of data-mining company Cambridge Analytica, which was linked to the Trump campaign. "We have to make sure people aren't using it to harm people or spread disinformation", Zuckerberg told senators.
Zuckerberg paused for a full eight seconds, chuckled, grimaced before ultimately responding with "no".
Lawmakers questioned whether the election meddling and poor controls on personal data requires the government to step in to regulate Facebook and other social media companies which generate revenue from user data. "Your right to privacy". He noted that larger companies like Facebook have more resources to comply with regulations than small startups.
Mr Zuckerberg's appearance marked the beginning of a two-day stretch for the mogul in Congress.
Russian lawmaker warns against Syria strike
Later on Tuesday, the UN Security Council will vote on competing USA and Russian draft resolutions on the Syria incident. Sheikh Tamim bin Hamad Al Thani said he and Trump "see eye to eye" on Syria.
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