Someone asked me this question the other day: Why do you use a blog to teach IELTS?
Here's my answer:
The advantage of a blog is that it can keep going and going (unlike a book or a course). Over the years, this blog has evolved as I've learnt more about students' problems, and as I've gradually refined my IELTS preparation methods.
The disadvantage of the blog is that the lessons aren't in a particular order, so there isn't a starting point or a step-by-step progression. However, I find this lack of structure interesting. I don't think we always need to study in a perfectly organised way. Perhaps the act of searching through the lessons and reading them in your own unique order makes the study process more engaging and creative.