Everyone is talking about Pinterest, and rightfully so. The rapidly growing online bulletin board is driving more referral traffic to other sites than Twitter, Silicon Filter is reporting.

According to data from Shareaholic, last month Pinterest trailed Google, Facebook, Yahoo, and StumbleUpon in terms of referral search traffic. Twitter was still leading Pinterest in January.

Shareaholic culls its data from more than 200,000 publishers that see around 270 million unique visitors every month. The analytics company also reported that purported ghost town Google+ is generating about as much referral traffic as Yahoo Answers.

In fact, recent numbers from comScore showed that people are spending less time on Google+ than they are on Pinterest and even MySpace. While they're averaging three minutes a month on Google+, they're spending about an hour and an half on Pinterest, comScore said.

Pinterest's meteoric rise is interesting in that it's atypical. It hasn't been driven by the usual early adopters on the East and West Coasts. Rather, it's been boosted by an army of women ages 18-34 in middle America. And these pin-happy females caused Pinterest to reach 11.7 million unique visitors in January, meaning Pinterest has passed the 10 million mark faster than any other standalone site in the U.S.

As if it isn't clear enough by looking at your own Facebook ticker, Pinterest's users are overwhelmingly female; 97 percent of the people who like Pinterest's Facebook page are women, stats from AppData have shown.

Though the early growth is impressive, it's probably only the beginning, especially since Pinterest is still open by invitation only.

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For more, see PCMag's full review of Pinterest and the slideshow above. Also check out How Do People Use Pinterest?