Blog is the best option to start making money on line.
1. It's free and you don't have to spend a dime on anything, hosting , domain name, web developer e.t.c.
2.You can drive traffic to your blog absolutely FREE with no cost.
3.You can set up as many blogs as you want FREE of course and multiple your profits.

There are a lot of blogs that started as a hobbie from their owners and now they are a real business sites with profits.But is it really possible to make a free hosting blog to a money machine ?
The answer is YES , but you have to stay focus on your target to achieve this. It's not going to happen in one night that's for sure but the blog it has many advantages instead of your real site and many tools (like technorati) that you can drive traffic to your blog just from your first post.