Feature request:
How about Google Circles supporting basic Venn diagram operations from the set theory

The implementation can be
1. There can be a button which says "Order by Expression"
2. When you type in the expression say "Friends" U "Family"
3. You get the results which include Friends and Family
4. You can either share something with the resultant group or save them in a new circle
5. Additionally the Text-box(Order by Expression) for input should support Union(⋃) and intersection(∩) letters minus(-) is already supported

This is a consolidation from various posts on smart Circles and especially Meta Circles by +Ofer Inbar
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