Originating as a social media movement to raise awareness for femicide in Turkey, the #ChallengeAccepted social media challenge has morphed into a larger movement for #womenempoweringwomen – with more than five million posts (and counting).

The rules are simple: once tagged, you must post a black and white photo of yourself onto your Instagram feed and tag up to 20 other women (friends, family, colleagues, etc.) to pass on the “challenge.”

See also: #ChallengeAccepted: What you should know before posting a black and white selfie

As you might’ve noticed, everyone and their grandma seems to have jumped on the trend – with international and local Hong Kong influencers and celebrities leading the way with some of the strongest and most powerful black and white posts. Here are some of our favourites, including several from our former #legend cover stars:

Cara Delevingne

Read our cover story with Cara Delevingne

Feiping Chang

Coco Lee

Read our cover story with Coco Lee

Demi Lovato

Read our cover story with Demi Lovato

Antonia Li

Zoe Saldana

Read our cover story with Zoe Saldana

Amanda Strang

Chiara Ferragni

Read our cover story with Chiara Ferragni

Angie Ng

Ruby Rose

Read our cover story with Ruby Rose

Utah Lee

Jessica Jann

See more from the #ChallengeAccepted feed on Instagram, and learn more about its origins here.