NEW YORK, NY - MAY 09: A presenter demonstates technology during TechCrunch Disrupt NY 2016 at Brooklyn Cruise Terminal on May 9, 2016 in New York City. (Photo by Noam Galai/Getty Images for TechCrunch)

NEW YORK, NY - MAY 09: A presenter demonstates technology during TechCrunch Disrupt NY 2016 at Brooklyn Cruise Terminal on May 9, 2016 in New York City. (Photo by Noam Galai/Getty Images for TechCrunch)

NEW YORK, NY - MAY 09: A presenter demonstates technology during TechCrunch Disrupt NY 2016 at Brooklyn Cruise Terminal on May 9, 2016 in New York City. (Photo by Noam Galai/Getty Images for TechCrunch)

NEW YORK, NY - MAY 09: A presenter demonstates technology during TechCrunch Disrupt NY 2016 at Brooklyn Cruise Terminal on May 9, 2016 in New York City. (Photo by Noam Galai/Getty Images for TechCrunch)

NEW YORK, NY - MAY 09: A presenter demonstates technology during TechCrunch Disrupt NY 2016 at Brooklyn Cruise Terminal on May 9, 2016 in New York City. (Photo by Noam Galai/Getty Images for TechCrunch)

WASHINGTON, DC - MAY 9: In this handout provided by NASA, NASA Chief Scientist Ellen Stofan looks through a telescope with a solar filter to see the planet Mercury as it transits across the face of the sun as Kelly Fast of NASA's Science Mission Directorate looks on at NASA Headquarters on May 9, 2016 in Washington, DC. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. (Photo by NASA/Joel Kowsky via Getty Images)

(FILES) This file photo taken on September 11, 2013 shows the logo of social networking website 'Twitter' is displayed on a computer screen in London. Twitter has barred US intelligence agencies from accessing a service that sorts through posts on the social media platform in real time and has proved useful in the fight against terrorism, the Wall Street Journal reported. The newspaper, in its report May 8, 2016, cited a senior US intelligence official as saying that Twitter seemed worried about appearing too cozy with intelligence services. / AFP PHOTO / LEON NEALLEON NEAL/AFP/Getty Images

TO GO WITH AFP STORY BY JENNIFER O'MAHONY Senegalese software programmer Ousseynou Khadim Beye poses with tablet computer displaying his Cross Dakar City application in Argenteuil, north of Paris, on April 22, 2016. Child beggars remain so numerous in Senegal they pass unseen, despite government pledges to eradicate the problem by 2015. Often from poor rural families, the talibes are sent to the Senegalese capital Dakar and other cities to memorise the Koran, leaving them vulnerable to abuse and at times receiving little real education. Arcade-style gaming app Cross Dakar City was launched a year ago to great fanfare at home and abroad, setting 32-year-old Ousseynou Khadim Beye apart as the first Senegalese software designer to make it solo onto the charts of the Apple and Android stores. With his app he wants to raise awareness of Senegal's child beggars. / AFP PHOTO / MARTIN BUREAUMARTIN BUREAU/AFP/Getty Images