HONG KONG - A breach in Twitter’s security that allowed hackers to break into the accounts of leaders and technology moguls is one of the worst attacks in recent years and may shake trust in a platform politicians and CEOs use to communicate with the public, experts said Thursday.The FBI said Thursday it is investigating the hacks, and said the high-profile accounts “appear to have been compromised in order to perpetuate cryptocurrency fraud."The ruse discovered Wednesday included bogus tweets from former President Barack Obama, Democratic presidential front-runner Joe Biden, Mike Bloomberg and a number of tech billionaires including Amazon CEO Jeff Bezos, Microsoft co-founder Bill Gates and Tesla CEO Elon Musk.