Aldi shoppers are being targeted by the latest fake voucher doing the rounds online.

The supermarket used its Facebook page to alert shoppers about a fake £85 Aldi voucher being circulated.

It indicates that the hoax message is asking people to share their personal details, which will help scammers commit ID fraud.

Aldi warns that it will never ask customers to share sensitive personal details for a promotion.

If someone sends you a Facebook message or email suggesting you could get an Aldi voucher treat it with caution and don't automatically click on the link.

If the the offer is too good to be true it probably is. Check for spelling mistakes and use your common sense about the details it is asking you to share.

This is the latest example of a supermarket voucher scam, which include fake vouchers and fake prize draws.

[Related story: Tesco survey prize draw scam email: what to watch out for]

How a typical voucher scam works

Typically, a voucher scam involves a 'free' voucher, with the store ranging from Asda and Tesco to Marks & Spencer and John Lewis which can be as much as £500.  A variant is to promise a free product like an iPad for “consumer testing”.

The company really doesn't matter. Whatever the name, and whether the too good to be true 'promotion' is on Facebook or via email, the whole thing is a swindle. They have nothing to do with the stores and, of course, there are no vouchers.

A scam of this nature can start with you receiving a Facebook message from one of your friends. It will say something like: “Happy Christmas. Free £500 ASDA Voucher Now. (173 Left). Claim your Free £500 ASDA Voucher this Christmas. Offer still open!” 

If you fall for it, you go to a site which looks as though it belongs to the company in question. The scamsters rip off logos hoping to dupe people into applying for their 'free' shopping opportunity. Here, you will be led through some questions to get your voucher.

You will have to supply your mobile number and your address – ostensibly so your “prize” can be sent out.

In reality, your phone will be hit by premium rate calls because each of the very easy questions costs £5, as shoppers caught by a Tesco prize draw scam are discovering. This may appear in the very small print, but who reads that when they are looking for a big boost to the Christmas spending budget?

At the same time, this “free offer” will also go to your friends.

In other cases, the link you get in the email or over social media may send you to a site which asks you to share more personal details, which puts you at risk of ID theft.

More on scams and how to avoid them