Friends List sounds like the same as Google+ Circles. However, FB Friends List requires both parties to accept friendship, whereas Google+ Circles does not. That's a fundamental difference in the resulting social dynamic.
Besides, I agree with Vincent Wong. G+ really isn't about social.
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I didn't think about this until I saw these slides: https://plus.google.com/photos/100238778462210489846/albums/...
Friends List sounds like the same as Google+ Circles. However, FB Friends List requires both parties to accept friendship, whereas Google+ Circles does not. That's a fundamental difference in the resulting social dynamic.
Besides, I agree with Vincent Wong. G+ really isn't about social.