The #deletefacebook movement took off following the revelations that Facebook had shared, without their explicit consent, the personal information of 50 million users with a Cambridge psychologist, which had later ended up in the hands of the election consultancy Cambridge Analytica.
There have been allegations that the information was used to help Donald Trump win the 2016 USA election.
The incident greatly undercut the public's trust in Facebook and ignited serious privacy concerns that many speculate could set off a mass exodus of users worldwide from the social network.
Facebook's shares fell more than 5 percent on Wall Street on Monday after the USA consumer protection regulator made public the fact it is investigating the firm over the Cambridge Analytica link.
Facebook is now facing investigations, probes and hearings from authorities in the USA, the United Kingdom, the European Union and Canada, while some of its major advertising clients are considering to stop placing ads on the social network.
Facebook users wishing to download their data can do so from the settings tab. The rules, approved two years ago, also make it easier for consumers to give and withdraw consent for the use of their data and apply to any company that uses the data of European Union residents, no matter where it is based.
The Reuters/Ipsos online poll found that 41 percent of Americans trust Facebook to obey laws that protect their personal information, compared with 66 percent who said they trust Amazon.com Inc, 62 percent who trust Alphabet Inc's Google, 60 percent for Microsoft Corp.
"Facebook has been complacent about its data security, to the point of irresponsibility".
Facebook founder Mark Zuckerberg. The company stressed that it does not collect call data on the sly and that it never sells the data.
In its response, Facebook said, "The most important part of apps and services that help you make connections is to make it easy to find the people you want to connect with". For one thing, it emphasizes that while it may be storing data about every phone call and text, including who contacted whom, what time, and how long the conversation was, it did not actually record the content of those conversations and texts.
Then in 2014, Facebook changed the app-sharing platform to significantly limit the data apps could access, in order to prevent abuse.
"This was a breach of trust, and I'm sorry we didn't do more at the time", Zuckerberg said, reiterating an apology first made last week in USA television interviews. "So, the first time you sign in on your phone to a messaging or social app, it's a widely used practice to begin by uploading your phone contacts", The Guardian quoted a statement released by Facebook's spokesperson.