One of the challenges of launching a new community or social networking site — or introducing new users to an existing site of more-than-modest complexity — is turning people on to the various features and areas. Any community site owner can rattle off a dozen "How do I — ?" questions that came flooding in to them in the first days and weeks of a public launch. (Even worse are the expected questions nobody is asking, because nobody has discovered that cool new widget or feature that apprently is languishing in obscurity.)
Ideally, good design can avoid the more obvious questions like, "How do I sign up?" But even the best-designed social networking site or online community is going to need some sort of introduction to its (hopefully) rich features. After all, new tools, ideas, widgets and usage trends are emerging every day, to the point that new sites almost always reach into feature areas that, for many, if not most, users were until that point largely unknown.