U.S. Twitter , Facebook , MySpace bans Twitter , Facebook , MySpace and other social media sites . Order , issued last a year , states that information on the sites poses a security risk . The Marine Corps fears that social media sites such as Facebook could pose a security risk . The Marine Corps ' ban is effective immediately and will Monday . U.S. Army recently ordered all U.S. bases to provide access to Facebook .
U.S. Twitter , Facebook , MySpace bans Twitter , Facebook , MySpace and other social media sites . Order , issued last a year , states that information on the sites poses a security risk . The Marine Corps ' ban is effective immediately and will Monday . U.S. Army recently ordered all U.S. bases to provide access to Facebook .