Jared Grusd, the 40-year-old new chief executive poached from Spotify four months ago, may need some of the stamina of his ironman triathlon training to maintain HuffPo’s reputation as a pack leader. At his first sit-down interview since taking charge, Grusd explains that HuffPo’s future will be global and played out in a new, largely mobile era he has dubbed “post-social”. Key to this is the changing role of social media sites like Facebook from places where people share news, to ones where they consume it.