I still haven't figured it out yet even AFTER Robert has explained it to me a gazillion times.............. I thought the company stream was everyone you followed (except the private groups) and the home stream were ones that you had POSTED a comment to. So confusing!!!!!!! Perhaps we should find something better...
To answer your question @DianeRuth , when I create a post, out of habit, I open up the group that I am posting to, then from there I create the post. When I did the posts announcing OASIS dues and the one regarding the Winter meeting in San Diego, I posted to the general discussion group but started with @Businessofconsulting (and other groups) on the first line and that posted to all groups that I wanted to hit. Clear as mud?