If I remember correctly there was a minor bump with the release of su.pr, but the recent growth has been correlated mainly with their mobile applications.
su.pr was launched in 2009, so I don't think there's a direct correlation. Just a lot of users and really good recommendation algorithms. They've been also steadily improving their mobile and ipad apps.
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SU's own recent blog post about their traffic: http://www.stumbleupon.com/sublog/20-million-stumblers/
I wonder if there is a correlation between the increase of traffic and the launching of their link shortener http://su.pr?
If I remember correctly there was a minor bump with the release of su.pr, but the recent growth has been correlated mainly with their mobile applications.
su.pr was launched in 2009, so I don't think there's a direct correlation. Just a lot of users and really good recommendation algorithms. They've been also steadily improving their mobile and ipad apps.