ATLANTA - While Facebook finds itself in the middle of its worst privacy crisis in history, a "Delete Facebook" message on a truck was spotted in Buckhead.

The truck was spotted near Lenox Mall on Wednesday.

11Alive tracked down the local man behind the campaign, University of Georgia graduate and CEO of VPN.com, Michael Garguilo.

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He bought the rolling advertisements in four cities – Atlanta, D.C., Austin and San Francisco – asking people to #DeleteFacebook. Garguilo organized protests to get the word out. On the ads, people could visit VPN.com/Facebook.

11Alive spoke to him to ask why go through all this hassle and expense.

"I just don't think Americans understand digital privacy. There's a whole slew of things people have to do to be truly private and secure on the Internet," he explained. "Getting off platforms like Facebook, who aren't honest about what they do with your data, is just one component of that."

Users who might have had their data shared with Cambridge Analytica began getting a detailed message on their news feeds on Monday. Facebook said most of the affected users (more than 70 million) are in the U.S., though there are over a million each in the Philippines, Indonesia and the U.K.

In addition, all 2.2 billion Facebook users will receive a notice section titled “Protecting Your Information” with a link to see what apps they're using and what information the users have shared with those apps. If they want, users can shut off apps individually or turn off third-party access to their apps completely.

Facebook CEO Mark Zuckerberg has acknowledged that he made a “huge mistake” in failing to take a broad enough view of what Facebook’s responsibility is in the world. He’s been testifying before Congress this week.

Cambridge Analytica whistleblower Christopher Wylie previously estimated that more than 50 million people were compromised by a personality quiz that collected data from users and their friends. In an interview aired Sunday on NBC’s Meet the Press, Wylie said the true number could be even larger than 87 million.

Facebook data scandal: How to check if your Facebook data was sold to Cambridge Analytica