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Unique visitor growth measured by comScore found newer and established web properties making big leaps last year.

Opening the doors at Facebook to anyone who wished to register proved a successful strategy at boosting the social network's audience. In the comScore top 20 of gaining properties ranked by percentage, Facebook rose by 81 percent to 34.6 million uniques in December 2007, compared to December 2006.

Impressive, but good enough percentage-wise only for seventh place. Other sites gained through a variety of means in comScore's determination of year-over-year increases for December.

List topper Everyday Health bought its way to the top by acquiring sites like Drugs.com. That boosted uniques to 12 million, a 349 percent gain. Women's category leader Glam Media opened new websites, picking up 25 million uniques for a 213 percent rise.

Clever promotions had their place in helping sites pull in more December visitors. OfficeMax had a hit on its hands when its ElfYourself.com greeting site gained a viral following. Their 15.3 million uniques virtually tripled from the previous December.

Craigslist continued to build on the shift from newspaper to online classifieds. Only Wikipedia, Facebook, Glam Media, and a pair of broadband providers outdrew Craigslist's 24.4 million uniques in December.