The "no make-up selfie" trend has helped charity Cancer Research UK raise more than £1 million through 800,000 text donations since yesterday.
The campaign, which began on social media on Tuesday afternoon (local time), asks women to post photos of themselves online without make-up, with the hashtag #nomakeupselfie.
Cancer Research UK told the Telegraph Wonder Women that it received almost a million unexpected donations yesterday, most of which came in via text message.
The charity also saw a rise in people donating at their Cancer Research UK shops, and a huge peak in visits to its website.
The trend seems to have begun with author Laura Lippman who posted a picture of her bare face in support of actress Kim Novak who was criticised for her looks, but has since become associated with charity Cancer Research after people began adding the hashtag #breastcancerawareness to the selfies.