Here I am going to provide a list of some social bookmarking sites which are very famous and everybody are using these.

https://slashdot.org/
http://blogmarks.net/index.php
http://bookmarking.info/
http://dabookmarks.club/
http://edge.highbookmarks.info/
http://highbookmarks.club/
http://highseoonline.ga/
http://linkatopia.com/
http://map.highbookmarks.club/
http://myhq.com/
http://only.highbookmarks.club/
http://pabookmarks.info/
http://paste.highbookmarks.club/
http://ppcnet.highbookmarks.club/
http://ppcteam.highbookmarks.club/
http://prbookmarking.club/
http://samaysawara.in/
http://seobookmarking.club/
http://seokhazanatools.com/
http://todays1051.net/
http://url.org/
http://vmoptions.cf/
http://www.designfloat.com/
http://www.folkd.com/
http://www.mybookmarks.com/
these are 25 top social bookmarking sites with DOFOLLOW links.

https://www.expert-seo-training-institute.in/blog/social-bookmarking-websites-list/