Facebook has suspended more than 400 of thousands of applications it has investigated to determine whether people's personal information was being improperly shared.

Applications were suspended "due to concerns around the developers who built them or how the information people chose to share with the app may have been used," vice president of product partnerships Ime Archibong said in a blog post.

Apps put on hold at the social network were being scrutinized more closely, according to Mr Archibong.

The app unit launched in March by Facebook stemmed from the Cambridge Analytica (CA) data privacy scandal.

Facebook admitted that up to 87 million users may have had their data hijacked by CA, which was working for Donald Trump's 2016 presidential campaign.

Mr Archibong said that a myPersonality app was banned by the social network for not agreeing to an audit and "because it's clear that they shared information with researchers as well as companies with only limited protections in place."

Facebook planned to notify the approximately four million members of the social network who shared information with myPersonality, which was active mostly prior to 2012, according to Mr Archibong.

Facebook has modified app data sharing policies since the Cambridge Analytica scandal.

"We will continue to investigate apps and make the changes needed to our platform to ensure that we are doing all we can to protect people's information," Mr Archibong said.

Britain's data regulator said last month that it will fine Facebook half a million pounds for failing to protect user data, as part of its investigation into whether personal information was misused ahead of the Brexit referendum.

The Information Commissioner's Office began investigating the social media giant earlier this year due to the Cambridge Analytica data mishandling.

Cambridge Analytica has denied accusations and has filed for bankruptcy in the United States and Britain.
Silicon Valley-based Facebook last month acknowledged it faces multiple inquiries from regulators about the Cambridge Analytica user data scandal.

Facebook chief Mark Zuckerberg apologised to the European Parliament in May and said the social media giant is taking steps to prevent such a breach from happening again.

He was grilled about the breach in US Congress in April.

Meanwhile, Facebook will pull Onavo Protect virtual private network application from the App Store after getting word that it violates Apple's data collection rules, The Wall Street Journal has reported.

The free application creates an encrypted VPN connection that routes internet activity through computer servers managed and secured by Facebook.

The app also alerts users when sites they visit might be malicious.

Facebook is able to gather information about how people use smartphones outside of the leading social network's services, potentially gleaning insights about rivals or internet trends.

"We've always been clear when people download Onavo about the information that is collected and how it is used," a Facebook spokeswoman said.

"As a developer on Apple's platform we follow the rules they've put in place."

Facebook did not comment regarding whether it is removing Onavo from the App Store.