"We will continue to fight for a government which is of the people, by the people, for the people,'' Ambassador Kyaw Moe Tun told the UN General Assembly in a surprise speech on Friday.
Facebook said on Thursday they have removed all of the remaining military accounts with immediate effect.
About 3,000 teachers and students stood their ground a short distance from the barricades and barbed wire as the police watched impassively, holding riot shields and cradling rifles.
The official Facebook page of Myanmar's military was removed for "repeated violations", the social network said.
The military junta warned it was prepared to use lethal force against rallies inciting "riot and anarchy".
Mya Thwet Thwet Khine had been demonstrating against the country's military coup, which happened on February 1. She was shot on February 9, two days before her 20th birthday.
The woman is the first confirmed death since the military's takeover earlier this month
Thousands of protesters rally near Yangon's central Sule pagoda in one of the biggest protests in Myanmar since the military coup on February 1.
A near-total internet shutdown was reported on Sunday night, as mass protests against the military coup entered their second week.
Facebook has pledged to reduce the distribution of all content on Facebook pages and profiles run by the Myanmar Military “Tatmadaw”, as well as accounts linked to the armed forces spokesperson Brigadier-General Zaw Min Tun.
Street protests against last week's military coup continued on Wednesday.
The situation is so bad, "even the introverts are here", as one demonstrator's poster put it.