Terror alerts get Twitter and Facebook accounts.
According to the Associated Press, some terror could be withheld from the public if announcing a threat would risk exposing an intelligence operation or an ongoing investigation. The alerts posted on Facebook and Twitter will have an expiration date as well.
The multi-level, multi-colored alert system is also changing, going to just two levels - "elevated" and "imminent."
Users who "Like" the Homeland Security's Facebook page will get the alerts within the news feed.