A blog (a portmanteau of web log) is a website where entries are commonly displayed in reverse chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog. (from Wikipedia)

Edublogs You can safely blog with students at Edublogs. You can moderate their posts easily and manage their accounts. PB Wiki has ad-free Wikis too. This is our Blog from the MACUL conference. AASL Blog (American Association School Librarians)