Woolworths has issued an urgent warning over a sophisticated Facebook scam.

The scam post – which is designed to look like an official Woolworths post with a barcode and the supermarket’s logo and branding – claims to offer users $100 off their next purchase when they use the coupon.

“Woolworths has announced that every customer that shares this link will be sent a $100 coupon for its anniversary. TODAY ONLY,” the post reads.

Users are asked to activate the coupon by clicking on the link and sharing the coupon with family and friends on Facebook.

On the provided link, users are asked to enter personal information to receive the coupon.

Woolworths said it has reported the scam to the Australian Competition and Consumer Commission (ACCC) and Scamwatch.

“Scams are often specially designed to look genuine, and often copy features from legitimate communications such as our logo and branding,” the supermarket giant said in a statement.

“Woolworths will never email, message, or call you to ask for your personal or financial information including your password, credit card details or account information.”

Woolworths advised customers to be vigilant and check the sites for authenticity. “For example, the link might take you to the website www.woolwoorths.com.au instead of www.woolworths.com.au,” the statement read.

A Woolworths spokesperson told 9news.com.au, “We encourage our customers to be vigilant of online and mobile phishing scams, which seek to imitate well-known brands to collect personal information. We will never ask our customers for their personal or banking details in unsolicited communications.”