The Internet has also become an important resource of emotional support for people with health problems. Susannah Fox says one in five Internet users has gone online to find other people who have the same condition.

SUSANNAH FOX: "It was more prevalent among people with more serious health issues -- one in four people living with chronic disease. And it was basically off the charts with people living with rare disease. They are so eager to find other people online who share their health concerns."

BOB DOUGHTY: A disease is considered rare if it affects fewer than two hundred thousand people worldwide. The rise of social networking has made it easier for people with rare diseases to connect with each other and feel less alone. Social networking is also changing the way some doctors and patients communicate with each other.

Dr. Jeff Livingston operates a medical center for women in Irving, Texas. His office uses password-protected computer software to share information with patients.

JEFF LIVINGSTON: "We provide the patient full access to their medical care. Anything I can see, the patient can see. All of their notes, all of their doctor visits are right there. All of their lab work is right there."

BOB DOUGHTY: Dr. Livingston says the software has increased efficiency, reduced costs and improved relations with patients.

JEFF LIVINGSTON: "It has just revolutionized the way we do health care."