The nice thing about blogs when supporting one's own attempts to learn about things like Web 2.0 tools is that even though you are alone at your own computer mucking things up as you go along. There is someone out there willing and wanting to share his/her own attempts at using tools and sharing the ups and downs of the journey. I don't feel so completely useless when I read that someone else has caused a major security issue on his/her computer as well.
Personalities emerge from the authors of blogs through both what they write, how they write, how they present it and of course what else they share on their blogs. Blogs allow for way more way more freedom in style of writing and because of that don't come across as daunting or impersonal as more formal writings on the same topics.