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Catblogging (traditionally “Friday catblogging”): The practice of posting pictures of cats, in typical cat postures and expressions, on a blog.

Collaborative blog: A blog (usually focused on a single issue or political stripe) on which multiple users enjoy posting permission. Also known as group blog.

Comment spam: Like e-mail spam. Robot “spambots” flood a blog with advertising in the form of bogus comments. A serious problem that requires bloggers and blog platforms to have tools to exclude some users or ban some addresses in comments.