Weblogs are a form of website. The therefore apply to them, as do But weblogs are also a special genre of website; they have unique characteristics and thus distinct usability problems.
One of a weblog's great benefits is that it essentially frees you from "Web design." You write a paragraph, click a button, and it's posted on the Internet. No need for visual design, page design, interaction design, information architecture, or any programming or server maintenance.
Blogs make having a simple website much easier, and as a result, the number of people who write for the Web has exploded. This is a striking confirmation of the importance of ease of use.
Weblogs' second benefit is that they're a Web-native content genre: they rely on links, and short postings prevail. You don't have to write a full article or conduct original research or reporting. You can simply find something interesting on another site and link to it, possibly with commentary or additional examples. Obviously, this is much easier than running a conventional site, and again indicates the benefits of lowering the barriers to computer use.
As a third benefit, blogs are part of an ecosystem (often called the Blogosphere) that serves as a positive feedback loop: Whatever good postings exist are promoted through links from other sites. More reader/writers see this good stuff, and the very best then get linked to even more. As a result, with disproportionally more links to the best postings.
Some weblogs are really just private diaries intended only for a handful of family members and close friends. Usability guidelines generally don't apply to such sites, because the readers' prior knowledge and motivation are incomparably greater than those of third-party users. When you want to reach new readers who aren't your mother, however, usability becomes important.
Also, while readers of your intranet weblog might know you, usability is important because your readers are on company time. (As an example, see -- among the ten best intranets of 2006.)
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