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What major sites are not considered a "discernible source" for traffic?

In reviewing my stats this morning I was thrilled when I saw views over 50 on one new hub! Yet, the majority of the traffic is from unidentifiable traffic. What sites might this include? Twitter? LinkedIn? How do I know what works if I cannot trace the traffic? I am seeking a repeatable model to encourage traffic but this is not helping me repeat successful marketing of my hubs.

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