What surprises me most about CC-licensed work is how often the author/licensor neglects one aspect of the license:
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Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work)
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Attribution in manner specified by the author or licensor. I can't remember a single time that I have seen anybody that uses CC specify in what manner they require attribution.
It would be quite simple to require reasonable attribution in a way that a user of pinterest can't do, and in that case use of the licensed work would be in conflict of the license used.
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Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work)
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Attribution in manner specified by the author or licensor. I can't remember a single time that I have seen anybody that uses CC specify in what manner they require attribution.
It would be quite simple to require reasonable attribution in a way that a user of pinterest can't do, and in that case use of the licensed work would be in conflict of the license used.
[1] http://creativecommons.org/licenses/by-nc-nd/3.0/