Shares of Workday (WDAY), arguably the most-anticipated tech IPO since Facebook (FB), popped early Friday in their first day of trading. The maker of software used for personnel and related tasks, or what the industry calls human capital management software, saw its stock soar more than 70% in initial trading early Friday. Shares then settled a bit and were up more than 65% in midmorning trading Friday. The initial public offering priced late