Aleksandr Kogan, the app developer at the center of Facebook's data privacy scandal with consultancy Cambridge Analytica, and his firm Global Science Research (GSR) were sold data by Twitter in 2015, the Telegraph reports.

"GSR did have one-time API access to a random sample of public tweets for a five-month period from December 2014 to April 2015," a Twitter spokeswoman said in a statement to CNET on Monday. Twitter conducted an internal review and did not find any private data about its users had been accessed. 

Cambridge Analytica is at the heart of a scandal that's stirred up two national governments and Facebook, the world's largest social network. Facebook banned the UK-based political data analysis firm last month, saying it had improperly received data from as many as 87 million user profiles.

Cambridge Analytica has never received Twitter data from GSR or
Aleksandr Kogan, and has never done any work with GSR on Twitter data. GSR was only ever a contractor to Cambridge Analytica and we understand it did work for many other companies.

— Cambridge Analytica (@CamAnalytica) April 30, 2018

Cambridge Analytica also stated on Twitter it had never received Twitter data from Aleksandr Kogan or GSR.