Quick Study: IBM, Citi Take Top Slots as Corporate Civic Leaders; On Twitter, Walmart Has the Most Active Followers

â–¶ Companies Best in Community: IBM, Citi and AT&T took top honors in the first ranking of S&P 500 companies that best use their time, talent and resources to improve the quality of life in the communities where they do business. Aetna and Capitol One rounded out the top five.