What It Is: "Starbright World is the premier online social network for teens with chronic and life threatening medical conditions, and their siblings."
Who's In Charge: Starlight Children's Foundation, which "for more than 25 years ... has been dedicated to improving the quality of life for children with chronic and life-threatening illnesses and life-altering injuries by providing entertainment, education and family activities that help them cope with the pain, fear and isolation of prolonged illness."
Why It's Worth Checking Out: As the site mentions, "Having a chronic illness or being a sick teen can be pretty tough on your social life, which is why the Starbright World community was established for teens to connect with other teens that are at home or in the hospital. Whether you have chronic asthma, cancer, leukemia, HIV/AIDs, kidney disease, cystic fibrosis, Crohn's disease, diabetes, sickle cell disease, or another serious illness or condition, you can log on and get to know teens like you in the chat room, blogs, bulletin boards, and more."
Where to Start: Read the Terms of Use and Privacy Policy before letting your child register.
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There are actually several that are at least as good, like LiveWire, which covers the same market. It was created by a university.
Good recommendation to read the Terms of Service and Privacy Policy!