Digg + Stumble vs Dofollow Blog Commenting

Hi, do digg and stumble upon give good backlinks? Do they have a better impact than dofollow blog commenting?

 

Yes, social bookmark sites with high PR are good for backlinks. I'm not sure if they are better than dofollow blog commenting...I use both as a means to create backlinks. I'm of the theory that the more places around the web you have quality backlinks spread out to, the better off you'll be.

 

I'm doing both of it for the sake of traffics and backlinks respectively.

 

Stumble Upon and Digg are good backlinks to index a site. Don't rely on them to increase rankings. Forum posting and Do Follow blog commenting are much more efficient.