Instagram started hiding "likes" on its platform in Australia, Brazil and several other major markets Thursday, saying it wanted to ease pressure on users, following criticism about its impacts on mental health.

The Facebook-owned social media giant's trial changes mean users in the six countries will no longer be able to see the number of likes other people's posts receive.

"We want Instagram to be a place where people feel comfortable expressing themselves," Facebook Australia and New Zealand policy director Mia Garlick said in a statement.

"We hope this test will remove the pressure of how many likes a post will receive, so you can focus on sharing the things you love."

Australia, Italy, Ireland, Japan, Brazil and New Zealand are involved in the new trial, which follows an initial test that was launched in Canada in May.

Although Instagram described the hiding of the likes for users as a "test", no deadline was given for when it would end.

Instagram, which has more than one billion users worldwide, is a platform that allows users to post images and videos that others can then like or comment on.

Social media scrutiny

Social media giants have faced increased scrutiny over the impact their platforms can have on users, and there is some research to suggest Instagram can negatively affect the mental health of young people who use it.

A 2017 study by the Royal Society for Public health ranked Instagram as the worst social media platform for young people's mental health in the United Kingdom.

"We are testing this because we want your followers to focus on the photos and videos you share, not how many likes they get," an Instagram spokesman said.

"We don't want Instagram to feel like a competition."

The latest measure came just a week after Instagram implemented new features aimed at curbing online bullying using artificial intelligence.

Agence France-Presse