DHS' Pilots for Social Media Screening Need Increased Rigor to Ensure Scalability and Long-Term Success (Redacted) [open pdf - 2MB]
From the Highlights: "Following the December 2015 terrorist attack in San Bernardino, California, Congress raised concerns about the use of social media by terrorist groups and requested that the Department of Homeland Security expand social media background checks. We conducted this inspection to review DHS' social media pilot programs. [...] We made one recommendation to help ensure DHS develops an effective social media screening program."
Department of Homeland Security, Office of Inspector General, Report No. OIG-17-40
Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/