In Vietnam, citizens were enlisted to post pro-government messages on their personal Facebook pages. The Guatemalan government used hacked and stolen social media accounts to silence dissenting opinions. Ethiopia’s ruling party hired people to influence social media conversations in its favor.

Despite increased efforts by internet platforms like Facebook to combat internet disinformation, the use of the techniques by governments around the world is growing, according to a report released Thursday by researchers at Oxford University. Governments are spreading disinformation to discredit political opponents, bury opposing views and interfere in foreign affairs.

The researchers compiled information from news organizations, civil society groups and governments to create one of the most comprehensive inventories of disinformation practices by governments around the world. They found that the number of countries with political disinformation campaigns more than doubled to 70 in the last two years, with evidence of at least one political party or government entity in each of those countries engaging in social media manipulation.

In addition, Facebook remains the No. 1 social network for disinformation, the report said. Organized propaganda campaigns were found on the platform in 56 countries.