Facebook on Thursday said it removed posts from campaign using fake accounts to praise US President Donald Trump as part of its latest crackdown on orchestrated deception.

The social network has banned US marketing firm Rally Forge, which coordinated the "inauthentic behavior" on behalf of the pro-Trump youth group Turning Point USA and Inclusive Conservation Group, according to head of cybersecurity policy Nathaniel Gleicher.

Activity at the bogus accounts mostly involved commenting on news articles rather than posting their own content, according to Facebook.

Comments about trophy or sport hunting were aimed mostly at the US, and a bit at people in Kenya and Botswana, Gleicher said.

The campaign included criticism of the Democratic party and its presidential candidate former vice president Joe Biden and praise of Trump and the Republican party, according to Facebook.

The network appeared to have started its operations in 2018, having take aim previously at the midterm elections in the US, the social network said.

Facebook removed 200 accounts and 55 pages at the social network and 76 Instagram accounts it said were part of the deception campaign and violated policy against coordinated inauthentic behavior 

About 373,000 accounts followed one or more of the campaign's Facebook pages and around 22,000 people followed one or more of the Instagram accounts, according to the social network.

"Many of these accounts used stock profile photos and posed as right-leaning individuals from across the US," Facebook said.

In 2018, some of the accounts posed as people with left-leaning views to make comments about news articles or public figures.

Facebook's investigation into the network was triggered by Washington Post reports about some elements of the campaign, according to Gleicher.

"Although the people behind this network attempted to conceal their identities and coordination, our investigation linked this activity to Rally Forge," Gleicher said.

"Rally Forge is now banned from Facebook. We are continuing to investigate all linked networks, and will take action as appropriate if we determine they are engaged in deceptive behavior."

Nearly a million dollars was spent by Rally Forge on advertising, with not all of those marketing messages connected to the deception campaign, according to Facebook.

While not formally linked to the Trump campaign, Turning Point -- which says it is active at more than 1,500 universities across the country -- has organized events for the president.