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StumbleUpon has just signed up its 12 millionth member according to a tweet from CEO Garrett Camp. Camp also indicated that the service is now seeing 500,000 new members join the site each month.

The milestone metric and the accelerating signup rate are especially telling given StumbleUpon’s roller coaster history — once an eBay-owned company, StumbleUpon returned to startup status in April 2009.
Since the dissolution of the eBay-StumbleUpon marriage, the company has worked to rebuild its stature with product enhancements, including a recent upgrade to its video product. These upgrades seem to be contributing to a renewed interest in the service.
At this rate, the serendipitous web discovery engine appears to be successfully transitioning from relic service to trendy startup — an impressive feat considering it launched in 2001.