Facebook accounts linked to the Islamic State group (ISIS) are still finding ways to evade detection on the social media platform, a new report claims.
One network's tactics included mixing its material with content from real news outlets, such as recorded TV news output and the BBC News theme music.
It also hijacked Facebook accounts, and posted tutorial videos to teach other Jihadists how to do it.
Facebook said it had “no tolerance for terrorist propaganda”.
The Institute for Strategic Dialogue (ISD), which carried out the study, tracked 288 Facebook accounts linked to a particular ISIS network over three months.
The group behind them was able to exploit gaps in both the automated and manual moderation systems on Facebook, to generate tens of thousands of views of their material.
Facebook said most of them had now been removed.
Networks of ISIS supporters were also found to be plotting, preparing and launching ‘raids' on other Facebook pages, including those belonging to the US military and political leaders.