It was my experiment to index my blog in Google search engine without any submission. Yes, i made it. They index my blog without submission. I only post my link in other sites, blog, forum and because of this they index my site very quickly within few days. This called the back-link. I know there is many person, worked in O-Desk or other financial site and work to post back-link. You can try for your blog or site with that works. It will help to your blog to get higher ranking.