Samoa, Dec. 5 -- Social media giants must crack down on anti-vaccination posts that are fueling Samoa's deadly measles epidemic from afar, UNICEF's Pacific islands chief said Thursday.

Sheldon Yett, the regional representative for the UN children's agency, said "incredibly irresponsible" online material on platforms such as Twitter, Facebook and Instagram had exacerbated the Samoa measles outbreak - which has claimed 62 lives since mid-October - by discouraging immunisation.

"It's quite clear that they have a corporate responsibility to step up to the plate and make sure that populations, particularly vulnerable populations, get accurate information that's going to keep children alive," Yett told AFP.

Immunisation rates in Samoa droppe...