A new Facebook craze is sweeping¹ the social networking site, where woman give details of their bra colour, to help raise awareness² for breast cancer.

社交网站Facebook日前刮起一阵旋风，女性用户纷纷晒出自己文胸的颜色，以提高人们对乳腺癌的防治意识。

Women have been giving details of their bra colour to help raise awareness for breast cancer on Facebook.

Thousands of female users - and some male ones - began updating their statuses on Friday with “beige米黄色”, “hot pink桃红色，艳粉色”, “crimson red”, “sexy black and gold” or even “nothing”.

As online confusion raged发怒，狂暴 and dozens of bloggers speculated推测，思索 about its meaning, it was disclosed it was part of a new campaign to help raise awareness for breast cancer.

Within hours of the craze starting, dozens of Facebook groups began appearing, with one group “breast cancer awareness ♥ I updated my Status with my Bra colour ♥”, having more than 33,000 fans.

The most popular colours appeared to be “white,” “black” and “beige”.

One blogger wrote: “Women everywhere are setting the bra colour they're wearing today as their Facebook status.

“The purpose is to promote breast cancer awareness, and remind women to get checked.

"The disease is very often curable可医治的，可矫正的 if caught early enough.”

Another blog suggests the craze狂热 was started by women in Detroit, trying to raise awareness for the disease.

Andrea Rader, a spokeswoman for the Susan G. Komen for the Cure foundation, said the group was not behind the campaign.

But she called it "a terrific tool for raising awareness."

She added, "We just hope people act on it — get educated, get a mammogram乳房X线照片."

Malorie Lucich, a spokeswoman for Facebook, said she was not sure where or how the craze started.

But she said it was an example of a "grass-roots" movement beginning on the social networking site.

"What is particularly unique about this grass-roots campaign is that it seems to have been started by a user or group of users, as opposed to an official entity实体，存在, and spread virally throughout Facebook," she told CNN.

"It's an ideal example of how an individual voice can be magnified放大，夸张 to create awareness for a good cause and ignite点燃 action among millions by using a site like Facebook."