I believe that "google groups" are run by member volunteers who monitor admission. I'm a member of one google group for which the moderators determine if the party interested in joining meets the membership criteria.
Also, NorCCRA (North Carolina CCRC Residents Assn) has 3 google groups: one for Res Assn Presidents to ask and share information; another for NorCCRA community reps who are not the RA President; and a 3rd special group to share environmental efforts to "go green." One has to contact the designated Communications person on NorCCRA's Executive Committee to "get in" to any of those 3.
As far as residents communicating with residents, after waiting and waiting for a Portal for years, two residents went ahead on their own and created an blog that anyone can access without any special sign-in code. Residents could post classified ads, warn about particular scams they heard about, provide special "thanks" and accolades to employees, seek those with special interests (a la "Anyone a chess player?"); make recommendations about local restaurants, tailors, car detailing; express wishes for the community's Master Plan, etc. People wanting to post something email a special blog email address with what they want to say, even including photos. Employees getting a nice compliment could have their families sign on and read it. A "box" categorizes the subject matter, and there's a "What's New" box that one can check to see what's been posted lately, without having to read through everything.
Another example: one couple did their own research and found a vendor to convert the bathtub in their cottage to a walk-in shower with a removable insert cut into the tub. They got it okayed by our Facilities Department, had it installed, then published their success on the blog, providing before/after photos.
These residents who created the blog knew that the Portal would be controlled by management. The blog is controlled by the residents who built it. A Portal was finally rolled out after the blog existed for 2 years. Did the Portal have a place for classified ads? No. Did it have a place for expressing a "job well done" by employees? No. Did it have a place to report scams or make recommendations for local services? No. The inventors of the blog wouldn't have minded "being put out of business" (that's just an expression -- it wasn't a business) by the Portal, but it continues on .... just not QUITE as active.
You're welcome to go to the blog and see how it works. Only first names and last initials are used, for security purposes. It works very well. www.tvablife.blog