(JTT here; logged in because the server wouldn't let me post a reply.)

3)

Eliza, a blog is a web-log, which is to say a series of short articles written for free (usually) and about a subject in which one's an expert (usually). Blogs vary from specialised economic material to the care and feeding of fingernails to aggregate sites where lots of people post..
You can get a free blog by signing up on Wordpress (among other sites; Wordpress is nicer than most).
I'd love to read a good education blog.

Lighter, I don't know why, or how level.