A Vietnamese court has jailed a music teacher for 11 years for Facebook posts the government said were "anti-state".

Despite sweeping economic reform and increasing openness to social change, Vietnam's ruling Communist Party retains tight media censorship and does not tolerate criticism.

Nguyen Nang Tinh, 43, was accused of "making and spreading anti-state information and materials" at the one-day trial at the People's Court in the northern-central province of Nghe An, Nguyen Van Mieng, Tinh's lawyers said on Friday.

Facebook is one of the most dominant companies on the internet. (AAP)

"At the trial, Tinh said the accusation was not true as this Facebook account didn't belong to him," Mieng said.

"The prosecutors stuck to the idea that the Facebook user named Nguyen Nang Tinh and my client Nguyen Nang Tinh are the same person."

Tinh, who teaches music at a provincial college, was arrested in May after he was found writing and sharing anti-state posts and videos on his Facebook account, police said in a statement.

Despite the oppressive regime controlling Vietnam, Australians are travelling to the country en masse. (iStock)

In late October, a 54-year-old architect was jailed for 12 months over the accusations he uploaded anti-government posts to his Facebook account, police said in a separate statement on the department's website.

Facebook is widely used in the Southeast Asian country and serves as the main platform for both e-commerce and dissent.

Nearly 400,000 Australians went on holiday to Vietnam last year.