"Many factors have contributed to the evolution of the terrorism threat on both the international and domestic fronts, such as: Lone offenders: Terrorist threats have evolved from large-group conspiracies toward lone-offender attacks. These individuals often radicalize online and mobilize to violence quickly. Without a clear group affiliation or guidance, lone offenders are challenging to identify, investigate, and disrupt. The FBI relies on partnerships and tips from the public to identify and thwart these attacks. The Internet and social media: International and domestic violent extremists have developed an extensive presence on the Internet through messaging platforms and online images, videos, and publications. These facilitate the groups’ ability to radicalize and recruit individuals who are receptive to extremist messaging. Social media has also allowed both international and domestic terrorists to gain unprecedented, virtual access to people living in the United States in an effort to enable homeland attacks."