Since last Wednesday, Google has integrated a tab on the sidebar where he has begun to show results of Google Places focused primarily on local businesses.
Since Google was saying that his strategy would be based on integrating all services and / or products included in Google + as main support.
From now on, the comments will show on Google Maps will be assessed from Google + Local, which will force users to register with the social network. So far, the presence for business in Google Local + is free, and will be an indispensable tool for SMEs in terms of local positioning.
What Google seeks, among other things, is to have more control over spam comments that are issued in Maps, with which you only have to have a Gmail account.