You can use this one, its up to date and also good. http://www.ebizmba.com/articles/social-bookmarking-websites
hi you can go to the link below for the do-follow sites. http://sites.google.com/site/dofollowsocialbookmarkingsites/
View attachment 65362 In genetics and epigenetics, bookmarking is a biological phenomenon believed to function as an epigenetic mechanism for transmitting cellular memory of the pattern of gene expression in a cell, throughout mitosis, to its daughter cells. This is vital for maintaining the phenotype in a lineage of cells so that, for example, liver cells divide into liver cells and not some other cell type. It is characterized by non-compaction of some gene promoters during mitosis. In terms of mechanism, it is believed that: * at some point prior to the onset of mitosis, the promoters of genes that exist in a transcription-competent state become "marked" in some way, * this "mark" persists both during and after mitosis, and * the marking transmits gene expression memory by preventing the mitotic compaction of DNA at this locus, or by facilitating reassembly of transcription complexes on the promoter, or both.
we all know that Book marking sites are No follow but they can definitely accelerate your rate of indexing the site and new contents. so we should continue book marking. and i think you have already found a lot of book marking sites
There are many sites available. They may be dofollow or nofollow sites. You may try google to search for the list of sites.