Blogging-Is it worth it?

There is an awful lot of controversy over blogging. Some say for blogging to be effective, you must write everyday. Others say--only when you have something to say. Some writers use it as a journal, others as a teaching tool and still others, like me, to post a thought, or comment. Is blogging writing, as in creative? Is it something intended primarily for the writer to post their thoughts? Input, readers. What say you?