Parmaukkha, who was handed a three-month jail term, has helped peddle a fiery brand of Buddhist nationalism and Islamophobia in Myanmar, a country accused of waging an ethnic cleansing campaign against Rohingya Muslims.
The monk was arrested in November over a rally he held outside the US Embassy in Yangon in April 2016 to protest against America's use of the word "Rohingya".
The Buddhist-majority nation refuses to recognise the Rohingya as citizens, referring pejoratively to the community as "Bengalis" and insisting they are illegal immigrants from Bangladesh.
"He has work to do...I love everything he does for religion and the nation," said Aye Lay, a 32-year-old supporter.
Anti-Muslim hate speech has been brewing in Myanmar for several years, often spilling over into bouts of bloodshed.
Religious hatred has surged in the wake of a ruthless military crackdown that has compelled 700,000 Rohingya to flee the country since August.
The UN says the campaign amounts to ethnic cleansing and possible genocide.
Over the past year religious authorities have taken some steps to curb the influence of ultra-nationalist monks like Parmaukkha.
His release today coincides with the end of a year-long public speaking ban on Wirathu - another firebrand monk known as the face of Myanmar's Buddhist nationalist movement.
Wirathu, once dubbed the "Buddhist Bin Laden", was barred from giving public sermons last year by a council of senior monks who said he had "repeatedly delivered hate speech against religions to cause communal strife."
The social media giant said it took down his page in January in accordance with a policy that prohibits "people dedicated to promoting hatred and violence against others".
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