Social networking is a method to link communities of people together in some fashion, usually by software. The software, though varies from network to network usually gives users the ability to share and upload photos, videos and bookmarks, blog, message friends, link with or make new friends.
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PatientsLikeMe is a social networking health site that enables its members to share information(symptoms, treatment, and condition) in order to monitor their health over time and learn from real-world outcomes.