sunnyujjawal - 5:37 am on May 16, 2012 (gmt 0)
After reading this post [searchengineland.com ] , I think only social bookmarking is the only off page activity that G is not counting in unnatural linking.
Factors covered in linked post are:
7. 82.5 % of your backlinks originate from prweb.com, prnewswire.com
10. Blog networks. No more to say here.
11. Article networks. Ditto.
12. Mass directory submissions outside your vertical.