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When I click on it it becoms one circle, but doesn't expain what it's for. Has anyone discovered what's it for?

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up vote 2 down vote accepted

Two empty rings: You're not connected.

First ring full, second empty: You're connected to the person, but he is not connected to you.

First ring empty, second full: The person is connected to you, but you have not connected to him.

Single full ring: The connection is mutual, reciprocated by both parties.

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Thanks. How did you know about this? – Michelle Jan 21 '13 at 21:21
i forget, here's the source link – ChristianD Jan 21 '13 at 21:28

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