Today Facebook sent an email to advertisers in Thailand informing them that ads will be reinstated in Thailand as of 0001 hours on Friday, 21st October.
They remain mindful of the mourning period and ask that each individual advertiser determine when to resume advertising.
See the email from Facebook below.
Thailand is in a state of official mourning after the passing of His Majesty King Bhumibol Adulyadej on 13 October 2016.