A rather 'revealing' fad-updating their status with the colour of their bras struck female Facebook users on Thursday.
The most popular colours were "white," "black" and "beige", reports The New York Daily News.
And then the girls soon began adding "training," "rabbit pelt," "chain mail," "Gilligan's Island coconuts" and "pleather with spikes."
It was followed by various explanatory e-mails claiming it to be a tool to raise awareness of breast cancer, or just "to confuse boys."
A fan club ungrammatically titled "I Really Dont Care What Color Your Bra Is" was soon gathering members at a rapid rate.