I came across this awsome site which makes the voting process automatic or favs for your social bookmarking sites, and it won't cost you a red cent!
Automatically get as many Diggs or votes, whatever the particular bookmarking site calls it, as you want.
manage your bookmarks stored at del.icio.us. one hit batch mode re-tag bookmarks en masse, make wholesale changes to URLs or update descriptions in bulk. toggle public/private sharing settings and mass delete bookmarks.
the folks over at eBizMBA have put together a list of the top 20 social bookmarking sites. They based their results on data on a combination of Compete.com and Quantcast data
B. Krause, R. Jäschke, A. Hotho, and G. Stumme. HT '08: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia, page 157-166. New York, NY, USA, ACM, (2008)