Are any or all of these sites worth promoting your Triond/Bukisa/AC articles??

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Are any or all of these sites worth promoting your Triond/Bukisa/Associated Content articles? There's so many of these social bookmarking sites out there, i have a theory that if you put each of your articles on all of them it may or may not give you hits from all of them maybe some but it would definitely increase your google pagerank I think. A1 Webmarks Ameba Blog Catalog Blogged BustaBlog Backflip Bibsonomy Blinklist Blogmarks Bookmark Tracker Buddy Marks Bitfu BX Business Week Care2 Connectedy Connotea Current Dealspl.us Delicious Digg Diigo Drop Jack Dizzed Eons Fark Faves Fleck Fresqui FriendFeed Furl Funp Folkd Google Bookmarks Humsurfer Ka-Boom-It Kirtsy Jumptags Livedoor Linkagogo Linksmarker Meneame Mixx My Jeeves Ask Mister-Wong MyVmarks Multiply N4G Netvibes NewsVine Orkut Oyax Oknotizie Pageflakes Pingomatic Propeller Plugim Reddit Swik Slashdot Shoutwire Symbaloo Spurl Stumble Upon Technorati Tagza ThisNext Typepad Vox Wikio Windows Live Wirefan Yahoo Bookmarks Yigg YuppMarks