Everyone knows that blog commenting is the best way to gain back links and consequently gain Page rank. The flexibility of blog commenting is that you are free to target your home page as well as deep links. You can put a link (and probably anchor it) to your homepage and get back links there or link to a sub-page and get links there too. My question: What if we give the link of the site map of a website when commenting on blogs? Will your back links increase? Will your PR increase? On what page will the PR increase be visible, if there is an increase in PR?