UNDP Goodwill Ambassadors actor Antonio Banderas, tennis player Maria Sharapova and footballers Didier Drogba, Ronaldo and Zinedine Zidane, are among a group of celebrities who, from today, will be using their social media networks to support the United Nations push for action against extreme poverty, hunger and disease. (..) Among those who have joined the effort are the following: (..) Paul Tergat (Kenya / World Food Programme (WFP) / runner).