(Reuters) – Facebook-parent Meta Platforms Inc said on Monday that billionaire investor Peter Thiel, who has been on the company’s board since 2005, has decided to retire. Thiel, one of the social network’s earliest investors, will serve as a director until Meta’s annual shareholder meeting but will not to stand for re-election, the social media giant said. Thiel became a Facebook investor in 2004, when he provided $500,000 in capital at a $5 million valuation for a 10% stake in the company and a seat on its board of directors. “Peter has been a valuable member of our board and I’m deeply grat…