What are the best way to advertise our blog on whole world?

Use social networking sites and if you are willing to spend some money use Google Adword...

I think advertising our website in the social networking websites will be a good idea.

the best way to advertise our blog is submitting blog in search engines, social book marking sites and networking sites, communitee sites, blog commenting, and directory submitting. But main thing is the content of the blog must be keyword optimized and quality content

try to bookmark your blog and submit directories of the type of your blog.