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Facebook fails with the segregation of social groups most humans have. In some countries a person does not make true friends at work, and friends are a personal casual thing. For some cultures a friend can be made in a few days, in other cultures it takes several months or years

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Perhaps that's why LinkedIn seems to be doing better: it has some selection of connections built into its premise, plus the information shared there is the minimal set that you usually wouldn't mind too much sharing across most of your social groups (got a new job, hooray!).

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