A blog is not a commitment to frequency or volume says Fiona Voss, it’s a place to have the ability to share whenever that urge may strike you.
“Why make it a blog, and not just a web page? Because if you have one thing you want to share with the world right now, chances are, eventually you’ll have another one, even if it takes a year or two. And next time, if you’ve already gone through the whole process of getting a blog online, it will be that much easier to publish your second post, and you’ll have a nice index of both your posts without any extra work. (Also, if you’re only posting once a year or so, it’s really handy for your readers if you have an RSS feed they can subscribe to.)”
H/T Frank Meeuwsen