Resolved (The tag was created by Taras Banakh a few months ago, since then it has grown to 12 questions and nobody raised any objections to this tag.)
I'd like to propose creation of continuum-theory tag.
To me (as an outsider, but still a bit interested in this topic) it seems that continuum theory is an area of general topology which enjoys some interest both among topologists and among mathematicians in general. (For example, one part of Open Problems in Topology is dedicated to continuum theory - 2 chapters in the first volume, 8 chapters in the second one.)
Quick search reveals several questions on the main with the word continuum or continua - of course, sometimes this word might be used in different meanings, but if you browse a bit among the search results you can see that several of those question are from this area or closely related to this topic.
The tag called (continuum-theory) also exists on Mathematics site. (See also the tag-info.) Since it's creation in September it attracted 11 questions.