What do you think would happen to your blog if you actually posted 1 blog post per day for 30 days straight? Check out this great video below from Seth Godin and Tom Peters on blogging.
If you want to increase your search engine page ranking and overall search engine optimization, then you want to maximize the number of backlinks to your site and Twitter is a great way to do that. A backlink is essentially a link to your site from another website or internet location. If you are a blogger and you include links to relevant sites and resources, then you are giving that source a backlink.