https://www.reuters.com/article/us-usa-justice-twitter-hack/fbi-says-it-is-investigating-hack-of-high-profile-twitter-accounts-idUSKCN24H32P >The FBI's San Francisco office said on Thursday it has launched an investigation after hackers accessed Twitter's internal systems to hijack accounts for high-profile people such as U.S. presidential candidate Joe Biden, reality TV star Kim Kardashian, former U.S. President Barack Obama and billionaire Elon Musk and used them to solicit digital currency.