US ads may be Russia-based

Facebook finds divisive US ads may be Russia-based

It covered the two years to May, encompassing the months leading up to the US presidential election. Facebook said it found no link to any presidential campaign.

The social media company said many of the ads promoted "inauthentic" accounts and pages and it had now suspended 470 such accounts.

The ads spread polarising views on topics including immigration, race and gay rights, instead of backing a particular political candidate, it said.