Police on Saturday arrested a well-known anti-junta activist on lese majeste charges in what rights groups said was the first such case in the reign of the Kingdom's new monarch.
Jatupat "Pai Dao Din" Boonpattararaksa, who has staged several anti-junta protests and held a hunger strike while in custody last year, was arrested at a temple in his home province of Chaiyaphum, said Pol Col Jaturon Trakulpan, a superintendent with the provincial police.
He will face charges under Section 112 of the Criminal Code, the lese majeste law. Police reportedly brought Mr Jatupat from Chaiyaphum to the Khon Kaen police station for prosecution.
Mr Jatupat, 25, is accused of sharing a link on Facebook to a BBC Thai profile of His Majesty King Maha Vajiralongkorn Bodindradebayavarangkun, who formally ascended the throne on Thursday following the death of King Bhumibol Adulyadej on Oct 13.
The Khon Kaen University law student wrote on his Facebook page registered in the name of Pai Jatupat on Saturday morning that Khon Kaen police were about to arrest him for sharing the report.
"This post was shared many times. We question why he was singled out," Anon Chawalawan of the legal monitoring group iLaw told Reuters. "It might be because he has a history of staging anti-junta protests."
The BBC launched its BBC Thai on Facebook page in August 2014 following the coup in May that year. Last month it introduced the BBC Thai website.
Mr Jatupat was earlier arrested and imprisoned on Aug 6 this year, one day before the constitutional referendum, for distributing leaflets opposing the charter, which authorities said violated the referendum law. He was offered bail but refused it.
He subsequently went on a hunger strike, was freed and rearrested before being released on bail after two weeks' imprisonment.
Mr Jatupat first came to public attention when he and his friends flashed a three-finger salute at a function featuring Prime Minister Prayut Chan-o-cha shortly after the coup in 2014.