Click here for my posts in English or go here for you to get more details about INconstantIN!------------------------------------------------------------------------------------------------------------------------------------Have you ever wondered which is the most popular social bookmarking site? I have. According to a poll results held at problogger.net, StumbleUpon seems to be the first in the top 3 social bookmarking sites.StumbleUpon with 31% s followed by Delicious with 21% and Digg with 19 %. By the way, do you use any social bookmarking site? If yes, which one? If not, why?