I think that the Communities on Google+ are great, as they allow people with a common interest to join and exchange information related to that common interest. Unfortunately, some real estate agents still consider ANY venue an advertising billboard. I started a community about Small Business Technology at Google+. Since I do have a lot of contacts in the real estate industry, it's a given that there will be a number of them who will join this community. However, it's a place where people with an interest in using technology in their business come to exchange information. It is NOT a place to join and immediately place a real estate advertisement, as this:
Mar 14, 2013 - Discussion
Preparing your home to be sold - XGBook Articles »
Do you wish to make a good impression on those who want to take a look at your house before you sell it? Do you wish to get a top dollar while being able to sell your house fast? Then, you would need ...
The link was to a poorly written article like so many written for article sites out there, and as the moderator of this community I took action; this person is now banned and the post removed. It's off-topic for the community and it's not the way to begin a conversation. I would equate it to walking up to me at a technology convention and reading the text of this article to me aloud. You wouldn't do that, so why would you do it this way? Simply because a venue exists, it doesn't make it a place for advertising, especially advertising totally unrelated to the reason the venue exists.