Blocks.com is more than just a journal, it's an online community of active traders who can read and comment on your work.
Your public blog entries will be viewed by thousands of those active traders. Anyone can offer feedback on your posts. You choose who gets to comment and you can delete any comments you don't like.
The benefit of creating a blog on Blocks.com (as opposed to another bloggin platform) is the built in community. Bloggers and readers on Blocks.com are focused on the stock market. Visitors will automatically be directed to your blog entries as you'll be a part of the greater stock market blogsphere.