There are numerous articles, books, conferences and training program to help you define your social architecture, and Idonot have the ambition to explain you the right way to do it (at least not in this article), but if you are looking for more explanations and advices, you should read the original post here: Social Media Landscape 2012.
If you work with a tax professional it is a good idea to fax him a copy before you call and ask about it, although Ido find it entertaining to try to explain notices that I am not looking at.