ReadWriteWeb

Social serendipity service StumbleUpon began opening up its new URL shortening service this morning and we have 250 invites included below. StumbleUpon is great for two things: discovering fabulous new websites and getting waves of traffic sent to sites you publish. The new URL service is indeed quite Su.pr (that's its name) but we wonder if it will lead to such an influx of publisher-submitted content that content submitted by users because it's cool will have more noise to compete with.

For publishers the service looks very cool, it includes features we haven't seen anywhere else and offers access to the huge Stumble audience.