Installing wordpress is free and gives you full control over your blog. There are other platforms like moveable type to choose from as well. Take a look around and find the platform you like or that best fits your blogging style. I've learned an expensive lesson and now will only build blogs on my own domain names.
The reason?
Lets start with blogger.com
They have a new out of control spam bot. Search the blogger help forums and you will find the horror stories. Legitimate blogs are being deleted, people are getting locked out of their blog until reviewed, and assumed to be a spammer because either the bot flagged the blog or someone clicked the little flag button at the top of all blogger blogs.
That and the fact that they have constant problems with the publishing getting stuck at 0%, slow load times, etc. it makes blogging through blogger.com a buggy experience at best and your content or reason for blogging is up to someone else's interpretation of what is or is not legitimate.
I understand getting rid of splogs and spammers, but in blogger.com's case the cure is worse than the disease. They were not always that way. I've been on blogger a long time and the service used to be good.
As far as wordpress.com, they are just as bad. If the blog links to a website and looks as if it might be promoting people to go to that website they will suspend your account without warning and lock you out of all the content.
I'm not sure what they think blogs are for, but they seem to think they have a noble purpose in life and that they alone decide what is a "genuine blog" or not.
A "genuine blog" is one that is controlled by the individual who writes to it, not one that must adhere to someone else's idea of what their blog should look like and what it should say.
If you blog on freehosts just be aware your content and your blog is in the hands of others who will decide for the world whether or not your blog should be seen by others.
I recommend all bloggers get their own domain names and install their own blogs. You probably have learned that using a freehost for your company's website is bad for business so why put your company's blog on a freehost?
Internet Marketing - Blogging On Free Hosts Not A Good Idea