I want to start a health blog about topics such as exercise, weight loss, weight gain ect. I was just wondering what free services are out there that I can use and that will give me some sort of sub domain or something like that for free. I don't want to purchase a domain yet. Also I need a blog service which will let me put up Kontera ads and adbrite ads. Thanks guys.
Well you CAN go with blogger but try branching out to vox.com too, i saw their traffic campaigns at stumbleupon, im sure you are gonna get a piece of that cookie
Of the main blogging sites on the web, two immediately spring to mind: Blogger and LiveJournal. Blogger would be easiest.