Facebook will wait to go public until September 2012, sources close to the company told the Financial Times on Wednesday. The initial public offering is expected to be around $66.5 billion—one of the largest IPOs in history. While the IPO had been expected to come in April 2012, sources close to the company say Facebook CEO Mark Zuckerberg wants to hold back because of the recent wild markets. Facebook currently does not disclose financial results, but they will be required to start publishing them by April 2012, according to SEC regulations.