StumbleUpon, the former eBay-owned web discovery engine that returned to startup status in 2009, is making a strong comeback. On Monday, StumbleUpon users set a new record: 27.5 million stumbles in one day, which equates to 320 stumbles per second.

The metric was shared via Twitter on Tuesday. The company tells us the record-breaking day follows a strong December, which saw more than 700 million stumbles for the month.

Web users are showing a renewed interested in StumbleUpon; it launched back in 2001 but was quickly losing relevance under eBay’s domain. However, 2010 proved to be a big year for StumbleUpon, as it crossed the 12 million-member milestone back in November and now has upwards of 13 million members, according to a company spokesperson.

StumbleUpon has been aggressively rolling out new features, but it — like social news site Reddit — is likely benefiting from Digg’s fall from grace.

The veteran startup is also said to be soon launching StumbleUpon Pro, a freemium option for businesses and publications.

What do you make of StumbleUpon’s renaissance? Share your thoughts in the comments.

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