Have you seen the new look that StumbleUpon has launched for your user profile. Similar to Yahoo Mail, it’s testing this
look out in “beta,” letting you toggle between the classic and updated
look for your StumbleUpon site.

Stumbleuponbetas

The big difference between the two pages is simply the layout. With
the updated look, you’ll get more of a social networking feel,
benefiting both yourself as a StumbleUpon user, and those that visit
your StumbleUpon page.

There’s also more access to other users on the site,
including those that have recently visited your profile. This adds more
networking capabilities to StumbleUpon, and makes it easier to share
content and make more friends.

In general, it seems that StumbleUpon is looking to incorporate more
social networking into its service. It recently launched a Facebook application

ON: StubleUpons New Look via @jpenabickley