If links pointed to one site but different pages or better limit them for certain number for one social bookmark and place remained on another?
good question my first thought was more links on your profile page = less weight. 2nd thought is ... usually they have "others linking to this site"... that liinks to profiles.. that would boost your porfile page and give more weight... well at least for those with "no follow" tags. answer i just don't know, but would be intresting to find out, but i would guess there is a cut off point somewhere, and it would depend how many are also linking to the page in the "social bookmarks" system it is on.
Do social bookmark links weight much for google? I have find one site contained with over 20 pages with zero pagerank and only 590 links founded for domain.com all filled with social bookmarks. It ranked extremely well for very competive words aka poker bonus codes and variations together with 5-6 pr monsters with thousand of related pages.