What type of links you built? No follow or do follow?

Can we able to rank a website with social bookmarking and social signals?
I am not much familiar with other link building concepts, but I heard that most of the social bookmarking links are no follow?

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80% dofollow
20% nofollow

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Most of the marketers seem to miss the big picture here! No-follow backlinks when they are relevant and originate on high rankings and authority site are as much effective as some crappy dofollow ones

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