Not just Facebook, Twitter also sold data to Cambridge Analytica researcher

According to the report, Twitter sold public data access "for one day" in 2015 to Aleksandr Kogan, then a psychology researcher with University of Cambridge, and his company Global Science Research (GSR).

"GSR paid for one day of access in 2015, Twitter said and scooped up a 'random sample' of public tweets covering a period between December 2014 and April 2015. Twitter added that it 'did not find any access' to private information," the report noted.

Kogan reportedly said the Twitter data had only been used to create "brand reports" and "survey extender tools" and that he had not violated Twitter's policies.

However, "the most immediate concern is that GSR could theoretically have correlated Facebook and Twitter data. Still, this shows just how comprehensive the data collection was," technology portal Engadget reported. The quiz app "this is your digital life" developed by Kogan and his firm GSR, collected data from millions of Facebook users without their consent in 2014-2015 which was later shared with the British political consultancy firm Cambridge Analytica.

The leaked data was said to be inappropriately used by Cambridge Analytica in activities connected with US President Donald Trump's election campaign in 2016.

Twitter, however, said it had banned GSR and Cambridge Analytica from buying data or running adverts on the website and that no private data had been accessed.

"Twitter has also made the policy decision to off-board advertising from all accounts owned and operated by Cambridge Analytica.

"This decision is based on our determination that Cambridge Analytica operates using a business model that inherently conflicts with acceptable Twitter Ads business practices," The Telegraph reported, citing a Twitter spokesperson.