A well-known public figure has been buying up shares at a head-turning pace.Shares of digital media company BuzzFeed (BZFD 24.00%) had been stuck in the doldrums over the past year. But today, the stock suddenly skyrocketed after former presidential candidate Vivek Ramaswamy disclosed a major investment in the company. As of 10 a.m. ET on Wednesday, BuzzFeed stock was up around 30% -- but it had been up as much as 82% earlier in the day.How much does he own?The market capitalization for BuzzFeed has mostly ...