Nico Sell, Wickr & Wickr Foundation, on the Code Stage on the last day  of the 2015 Web Summit in the RDS, Dublin. “Laconic and iconic hacker/artist/company founder of messaging app Wickr Nico Sell says every company should hire hackers to try to break their service.” Photograph: Sam Barnes/Sportsfile/Web Summit

It’s Thursday, the last day of the last Web Summit in Ireland. Maybe. Crowds have thinned noticeably, but that just means you can push past people, ra(...)