Do follow social bookmarking sites:

Dofollow social bookmarking sites plays an important role in search engine optimization.  By using these sites will help you to drive massive traffic and also helps you to generate quality backlinks. Dofollow bookmarking increases your SERP Ranking.

Here is a  Detailed Article about Social Bookmarking websites, You can find it here.

Here is the list of Do follow social bookmarking sites list:

S.no	Dofollow social bookmarking sites
1	https://www.facebook.com
2	https://www.plusgoogle.com
3	https://www.pinterest.com
4	https://reddit.com
5	https://www.scoop.it
6	https://www.twitter.com
7	https://www.diigo.com
8	https://www.bizsugar.com
9	https://www.metafilter.com
10	https://www.stylehive.com
11	https://www.stumbleupon.com
12	https://www.getpocket.com
13	https://www.tumblr.com
14	https://www.slashdot.com
15	https://www.fark.com
16	https://www.plurk.com
17	https://www.blogmarks.net
18	https://www.delicious.com
19	https://www.tryengineeringnews.org
20	https://www.bibsonomy.org
21	https://www.tatvanstories.com
22	https://www.pixador.net
23	https://www.usefulenglish.net
24	https://www.yemle.com
25	https://www.zariaetan.com
26	https://www.openfaves.com
27	https://www.sitejot.com
28	https://yoomark.com
29	https:www.bookmarkingcentral.com
30	https://www.postolia.com

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I hope you found this article is useful. If you have any other high pr social bookmarking sites, Feel free to share with us. Also, mention your thoughts in the comment section. I would love to hear your comments.