Bloomberg: Flipboard debuted in 2010 with the kind of fanfare any startup would envy. The news-reading app piggybacked perfectly on the debut of Apple’s iPad tablet. Critics loved Flipboard’s magazine-like layout, and investors poured money into the company. Almost five years later, Flipboard is struggling to live up to the praise. Several senior execs have departed, and talks to sell the company haven’t reached the finish line.