Over the last little while, I have contacted developers of apps with various issues and suggestions I have. In the Play store, you can find out how to contact the developers. Every time I have sent a developer an email with my comments and feed back, I have gotten a very timely response.
Integrating G+ with the Play store is supposed to allow developers to contact G+ users regarding reviews and comments they have left. I am wondering how much of an effort will developers make in contacting users about their reviews. I do see a number of reviews where it appears the user does not quite understand how to use the app properly. I am also wondering how users feel when they are contacted by a developer via G+.
When I email a developer I am expected a response. Generally I do not like messages that I get out of the blue from someone I do not know. Perhaps I am a bit suspicious in these days of SPAM and phishing attacks.