"Content creation tops the list as the most effective tactic for SEO. As organizations increase website content, they are able to achieve higher rankings, and a greater number of listings in the search engine results pages. This ultimately leads to increased inbound traffic from search engines."
Conclusion from the new marketing research chart issued by Marketing Sherpa.
Take a look at their chart for a comparison of different tactics.
Content creation was rated most effective by 93%, blogging by 78%.
You can download a free executive summary of their report.
Via Liz Wilson