Here are 3 key things I noticed about each account:
Harvard Biz: Focuses on sharing thought-provoking articles and insights about business/leadership; Tweets several times per day; Engages with followers by responding to questions.
American Express: Highlights customer service, rewards, and deals; Shares branded content and photos; Engages customers and answers questions in real-time.
Red Cross: Raises awareness about ongoing relief efforts and encourages donations; Provides emergency preparedness tips; Quickly responds to concerns and offers assistance during crises.