Web 2.0’s will inevitably change.
StumbleUpon has already launched StumbleVideo, which searches through predetermined sites like YouTube, Google Video, Metacafe, and MySpace Videos; StumbleThru, which searches sites such as The Onion, Public Broadcasting Service and Wikipedia; and, the aforementioned Su.pr (stumbleupon, 2009).
I think this evolution in StumbleUpon's searching parameters is rather interesting because it enhances a user's stumble results. Stumbling amongst sites like TheOnion, Public Broadcasting, and BBC ensures the content returned to you is vetted for accuracy. True, an an average Stumble can and will take you to vetted sites; however, you will come on sites that are not vetted near to the standards of BBC News--who stake their livelihood and reputation as a news source for accurate information.