First there was the No Makeup Selfie, then there was the Ice Bucket Challenge. Now, there's a new social media craze taking over our Twitter feeds, with an equally important purpose.
People are taking photos of themselves with tampons and posting them online in support of the #JustATampon campaign.
Famous faces including Jon Snow, Cathy Newman, Carol Smillie and Jenny Eclair are among those posting the snaps to Twitter.
— Carol Smillie (@carolsmillie1) June 8, 2015
The selfies are just one part of the #JustATampon campaign. V.Point has also created a hilarious video exposing how little men know about periods here in the UK, while Plan UK is inviting members of the public to donate £3 in order to support women abroad.
"Your donation could help support our menstrual health work in the developing world and our project dedicated to transforming girls lives. Just £3 can provide a girl in Uganda sanitary towels for a year," the Plan UK website states.
"Donations will help tackle discrimination faced by girls globally, not just around menstrual hygiene but other issues they face including child marriage and female genital mutilation."
You can donate £3 by texting TAMPON to 70007 or donating online here.