Which is the best Off Page SEO Factor?

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1. Social Networking Sites
2. Blogging
3. Blog Marketing
4. Forum Marketing
5. Search Engine Submission
6. Directory Submission
7. Social Bookmarking
8. Link Baiting
9. Photo Sharing
10. Video Marketing
11. Business Reviews
12. Local Listings
13. Article Submission
14.Classified Submissions
15. Answer Questions