Uncategorized Twitter proves invaluable in a crisis The Red Cross learns that tagged ‘tweets’ are ideal for fast and frequent updates during a disaster. By Ragan StaffOct. 29, 2008 SHARE To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.