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Yes, the name "Circles" is awesome.

Yup. Circles was also the name of social groups in Microsoft's threedegrees software.

WRT to the sibling post I'd be inclined to think that circles being such a common synonym/abbreviation for "social circles" that it lacks sufficient distinctiveness to indicate the origin of a product related to social networking.

If they wanted an RTM then they should have gone for a misspelling.

Is that in a similar enough field for trademark infringement?

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