Vietnamese Facebook users have no access to the social networking site as the government of the country place a restriction this week, which is also the scheduled visit of US President Obama to Vietnam. According to the government, it is to hinder anti-government protesters from utilizing the site for their propaganda.

The Verge reported, two activist groups stated the restriction started from Sunday until Wednesday this week, while the President Barrack Obama made a visit to the country. They also said, the site was restricted and was sometimes blocked by the government for them not to get access on the site, preventing from posting anti-communist government.

The news of restriction-blocking broke out in Twitter and was reported by a digital advocacy group called, Access Now. It is also said, the group is working with pro-democracy activist, Viet Tan. The US president visited the country to improved US-Vietnam relationship.

Obama’s three-day visit to Vietnam ended on Wednesday. Obama largely focused on normalizing relations with Vietnam. But he also promoted human rights and chided Vietnam about restrictions on political freedoms after critics of its communist-run government were prevented from meeting him.

Unfortunately, shutting off access to Facebook is not uncommon in Vietnam, Reuters reported. People were using Facebook to call for protests. Angelina Huynh, an advocacy director for Viet Tan. Wielding access to Facebook and Twitter as a weapon against activists is also a routine practice in other countries.

Barack Obama waved goodbye to Vietnam on Wednesday, following meetings in Hanoi and Ho Chi Minh City with Vietnam’s new leadership, young entrepreneurs, and civil rights activists. Security measures were tightened in Hanoi and Ho Chi Minh City, allowing nothing more than small groups to assemble and demonstrate. In Ho Chi Minh City, some protesters were hoarded onto buses and driven far from the protest areas.