Linda Sarsour is Director of the Arab American Association of New York, a social service agency serving the Arab community in NYC.

WHITEHOUSE: Connecting the Dots

Today, after 33 years, CASL has grown from a one-person shop in 1979 to become the largest, most comprehensive social service agency in the Midwest dedicated to serving the needs of Chinese Americans.

WHITEHOUSE: Champions of Change Blog

Jason Stein, the founder of Laundry Service, a social media agency which at times pays others to tweet about its clients, said he would never pay someone to tweet about a client without paying Twitter to amplify that message as well.

FORBES: Why the AP Selling its Own Sponsored Tweets is Good for Twitter

Within the four cause areas that Warner Bros. targets, Warner Bros. employees work with local nonprofit organizations such as A Place Called Home, a youth center in South Los Angeles and Volunteers of the Burbank Animal Shelter, an animal service agency devoted to providing medical, social, behavioral and financial care for animals at risk.

FORBES: Lights, Camera, Impact: When Employees Run the Community Giving Show