Subject line: Can you recommend a great restaurant in (your current city)?  We inferred current city from their IP address.
Subject line: Best restaurant in (your current city) - agree or disagree? We inferred current city from their IP address.  
Subject line: You're invited!  Especially in these three new points of sale, I thought it would be nice to explicitly remind readers that they're welcome to review. People like to be asked. 
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