All comments are moderated. E-mail address is NOT required; it does NOT get public. However, it sometimes helps clarify your inquiries if you leave one. Also, choose a name you are comfortable leaving for the world to view. If you leave info in the comment that is private, please indicate that. Otherwise tech support has to guess.
If you have a blog or website, include that in the form (URL) for others to find (and for us to check). Not everyone has E-mail, so that can be left blank. If you want other readers to contact you, leave a mailing address in the comment but mark it as public information.
Sometimes readers have left questions as comments or which contain information that might be inadvertently personally identifiable. Tech support deals as best as possible with these or routes them to me.
Here’s an image of a WordPress comment form (click on the rhumbnail image to get a larger view). The appearance changes depending on the theme. For other blogging platforms the comment boxes may look differently. I think the general rules apply as to “name” visibility in public (what you put is what the world sees). If the blog requires an email address, generally that is kept private by the moderator (blog owner) but one has to trust their blogger. Some comment forms allow you to get replies and further comments via E-mail (as below).
Categories attached to individual entries or posts will direct the reader to other WordPress.com blogs using that category. The categories in the sidebar will show only posts from this site. The site search tags in each post or page (see below for examples) will search for those terms at this site.
Site Search Tags: wordpress+tips, commenting, categories, policy, tags, blogs