Mark Zuckerberg's fortune has grown by about $44 billion this year, making him the billionaire with the most significant increase in wealth according to Bloomberg Billionaires Index. This is due to his focus on cost-cutting at Meta Platforms Inc. and working on a real-life competitor to Elon Musk’s Twitter. The pivot has made Meta shares the second-best performer this year on the S&P 500, soaring more than 100% and pushing Zuckerberg's net worth to $89.9 billion. Additionally, Meta's Instagram platform is planning to launch a competitor to Twitter as early as next month, which could be a threat to Twitter whose engagement may have been hurt by charging heavy users a monthly subscription fee.