This year Tesco is 100 years old and to celebrate the chain launched a series of discounts.
But what it doesn't do is launch a gift voucher on Facebook to celebrate – but that's what scammers claim on Facebook.
A Tesco spokesman told Mirror Money: "This is not a Tesco offer. We will always ask customers to be vigilant and check the validity of coupons, vouchers, or online competitions.
"If you are not sure about the coupons / vouchers you see online, you can always check by contacting our customer service team at 0800 50 55 55.
"Customers can also visit our privacy center, where we have some advice on staying safe online and how to be aware of fraud and phishing."
What is worrying, the last time this scam hit Facebook in 2017, Tesco buyers are far from the target.
Counterfeit vouchers began to circulate for Sainsbury, Asda, Waitrose, Iceland, Argos, John Lewis and Morrisons as well.
An Action Fraud spokesman told Mirror Money that customers must be vigilant before clicking on unsolicited links.
"Fraudsters will do everything they can to try and take personal and financial details from their victims. It is very tempting to click on the links for vouchers while browsing on social media," said a spokeswoman.
"But we ask people to be careful clicking on unsolicited links and suggest that they do their research first, before providing personal or financial details."
Fraud tips on actions to protect yourself from online voucher fraud
- Be careful about clicking on unsolicited messages on social media, even if they appear to be from trusted contacts.
- Research online first – check the official supermarket website to see if there are genuine offers available.
- Make sure you have anti-virus software on your computer
- Never give out personal or financial data including usernames, passwords, PINs, ID numbers or phrases that are easy to remember.