Protesters are urging Facebook users to create a virtual smokescreen to prevent local law enforcement from targeting activists trying to block the controversial Dakota Access oil pipeline in North Dakota.

The Standing Rock Sioux Tribe and others protesting the project are asking any and all Facebook users to check in at the Standing Rock Indian reservation’s social media page. The protesters said by checking in at the reservation, social media users will be helping to thwart local law enforcement from breaking up the protesters assembling at prayer camps to block the pipeline.