Actually it's called MSN Spaces. Nevertheless, I've tried My Space, and it's to basic. I havent tried hi5 because they spam my inboxes daily. MSN Spaces is everything I need for a blog, very easy to navigate, themes look good, not to mention all the settings you can have .
also msn spaces has less troubles than the others, even though, they are different than each others! u know in hi and my space u can send messages to a contact u see, u can post a picture comment, umm it's clear msn space in made for for blogging and like a photo album, but the others are more to meet other people!