Stumbleupon is much more than just a social network tool known from such sites as friendster or orkut. It provides addition with features like - Link Recommendation (which is the main purpose) - Topic Surfing (which makes it a great research tool) - Channel Surfing aka co-browsing (which means leaving your comments on sites, pages and people) - Web and Photoblogging - Recommend to friend via mail - Bookmark collecting - Community forums - Site promotion - And a lot of fun ! All of this adds up on meeting a lot of friendly people, that have the same interests as you have. Privacy issues might worry you: SU leaves you full freedom of entering details about you. The only thing that leaves a trace of your identity is in my view a collection of which sites you prefer and your probably everchanging IP number. You cannot be connected to your surf-preferences if you dont reveal your identity, as your email address is not visible for other users. So privacy is not really an issue as it may be in other networks you might find, and if you don't care building up a data-minable collection of likes and dislikes connected with other peoples likes or dislikes.
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