[Older, but extremely relevant at this time. Also sheds light on Trump's abuse of the platforms for propaganda and subsequent outrage over suspensions and bans?]

Russian Institutions with close links to Kremlin financed stakes funding Facebook and Twitter investments through Trump son-in-law Kushner's venture investor, leaked files reveal

https://www.theguardian.com/news/2017/nov/05/russia-funded-facebook-twitter-investments-kushner-investor