Yeah, a magazine is more like a "topic" but that's too broad of a term I think.

My understanding of the term "magazine" is that it's supposed to denote that a magazine is composed of different kinds of content that fall under the same general topic, just like a real paper magazine is a mix of content (i.e. long form articles, short essays, q&a sections, photos, the fancy CD in the back, etc.) So a kbin magazine can encompass text posts, photos, videos, microblogs, etc.