In a rare display of candor ? or as part of a calculated exercise in reputation management ? Sam Bankman-Fried delved deep into his mental health struggles in a trove of unposted tweets obtained by CoinDesk?s Christine Lee and published for the first time on Friday. ?I don?t really know what ?happiness? means,? he said in one of the tweets, which he wrote just weeks after his crypto empire blew up last year, as he was facing down a tidal wave of public scorn.