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.