A week after releasing a redesigned iOS app, StumbleUpon today unveiled a very Pinterest-inspired redesign of its website. The new layout features a vertical waterfall of tiled content, color-coded by category and with the ability to pull it together into lists. The new StumbleUpon is also more social, enabling users to stumble the pages liked, commented on, or shared through Facebook and Twitter. The new site is available in StumbleUpon’s Labs section. [Source TheNextWeb]