Recently I announced I was going to talk a bit more about the impact of social media on search engine marketing and how both strengthen each other.
There are many ways of improving the position of your blog, website, etc., using social media marketing, content marketing, community marketing and the likes.
A good and valuable Twitter account has a positive impact on the search engine ranking of your website or blog. The same goes for social bookmarking on platforms such as Delicious and Digg, a good number of presentations on slideshare, white papers with hyperlinks, etc.