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Multiply is a social networking service with an emphasis on allowing users to share media - such as photos, videos and blog entries - with their "real-world" network. The website was launched in March 2004 and is privately held with backing by VantagePoint Venture Partners, Point Judith Capital, Transcosmos, and private investors. Multiply has over 11 million registered users. The company is headquarterd in Boca Raton, Florida.
On Multiply, a user's network is made up of their direct contacts, as well as others who are closely connected to them through their first-degree relationships. Additionally, users are encouraged to specify the nature of their relationship with one another, making it possible to share content with their entire network of closely-related people, or subsets thereof including friends, family, professional contacts, and so on.
Multiply is also known for stronger user security than most social networking sites. Users can limit if their item can be viewed by setting security settings to Public, Private (network only), or Private (invite only) for each item on their site.