The social network said the move is in observance of a "cultural custom" as the nation mourns the late Thai King, Bhumibol Adulyadej, who died Thursday at the age of 88.
"Thailand is in a period of mourning due to the death of the King and removal of ads is a cultural custom," a spokesperson wrote to advertisers in a blog post.
"We don't yet know the duration of the mourning period. We'll keep you posted of any additional details as they become available," he said.
National media broadcasts went black as his body underwent a traditional bathing ceremony.
As part of his remembrance, many Thai citizens are wearing only dark colors this week, and several websites and television stations have gone completely black-and-white. Monochrome footage of the widely revered leader's life has dominated the airwaves.
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