Here is how I would approach G+ Communities:

1. There a lot of online marketing, make money, affiliate type communities on G+ and many of them are quite large. That means the WA promo site owner could easily post their site sharing blogs to a different marketing community every day without re-visiting the same community in a week.

2. Please DO NOT spam G+ Communities! You will simply be cutting your own throat; once a week per community is plenty. Be part of a half dozen or so communities and spread your site sharing out.

3. The niche site owner will probably have fewer communities to work with, but you should still implement a strategy of regularly sharing your positive reviews with the appropriate communities for your niche…just don’t overdo it.

4. Both site owners should sign up for as many appropriate G+ Communities as they can find…just don’t enable notifications on all of them, if you don’t want to get overwhelmed.

In conclusion…what can we expect as a result of increasing our G+ Shares and helping each other out? I really can’t predict that with any certainty.

I do know...that G+ activity is taken into account by Google with respect to their search engine rankings.

I do know...that we need to do a lot more G+ Shares relative to our +1s to take boost our Google rankings.

Just one more page...my personal offer of help to those who are interested.