Say goodbye to color-coded terror alerts and hello to warnings and Facebook and Twitter. As part of their overhauled advisory system, the Department of Homeland Security is introducing two levels of warning—elevated and imminent—that may occasionally be distributed via social media, reports the Washington Post. The two warnings will both come with an expiration date instead of the vague rainbow colors of anxiety that the system instituted in 2001. The new alert system, which is intended to be more specific and useful, will be in place by April 27. The details emerged for a Homeland Security report dated April 1 obtained by AP.