4. Free Hosting platform
Blogger
Over-blog
Wordpress
Weebly
Tumblr
etc...
each of these one have got different characteristics
and different numerical identities
5. Main advantages
It's easy to use
It's ready to use
It's cheap or free
There's an hotline or an deskhelp behind
There is SEO because of the platform
You don't need any technical konowledge to use
it
6. Self hosted blog
For a self hosted blog you need
A software (Wordpress, Serendipity Movable
Type, Dotclear...)
An hosting place
A domain name
Sometimes an uploading software
7. Main advantages
More options
More freedom
More security
More customisation