Proposal: Amateur Radio
As mentioned in this answer, there is a discussion about if CB radios should be allowed. So, should they?
The Belgian Institute for Post and Telecommunications (BIPT) makes a clear distinction between the citizen's band and PMR on one hand, and the amateur radio service on the other hand. All are grouped though under the common denominator of "private radio communications".
In view of this, I would certainly not ban CB questions (because CB is often a stepping stone towards amateur radio proper). However, neither would I actively promote this group as a CB outlet.
I think this will depend on what the general feel of this site turns into; if we discuss lots of technical issues such as radio design, homebrew, microwave, etc. then it will tend to exclude CB users. (Don't forget that their gear has to comply with regulatory standards and their modes and frequencies are limited.)
If we discuss antenna design, propagation and operating techniques, it may include them as they may be interested in this too.
I think they will read the site for useful nuggets, even if they are not actively encouraged to ask questions, and no, I don't think we should attempt to exclude them. Besides, many of us have dabbled with CB in the past, even if we try to pretend otherwise ;-)
I would make two points for having CB discussions being OFF topic.
The ham and CB communities, in my limited experience and in my humble opinion, are separate and distinct with disparate origins.
In the U.S., all amateur radio licensees operate under the FCC's definition of "Amateur Radio Services," "Amateur Operator," etc. contained in Part 97, Title 47, Code of Federal Regulations. CB, and the other forms of Personal Radio Services, have different requirements under Part 95.
Amateur Radio is so heavily inculcated with the principles contained in Part 97 that to include CB would muddy the waters.