How do I determine if a Facebook link is a scam?

Yes, this is a scam.

• Virus Warning! What to do! - Apple Community
• Scam Pop-ups, Scam Viruses, Scam Receipts… - Apple Community

Remote sites cannot scan the contents of your iPhone. That remote access would be a catastrophe. If that access were possible, the same miscreants with these adverts would steal everything directly, as malware scans are deeply intrusive.

In this case, it’s probably a pop-up advert for a “coffee shop” VPN app, something which won’t address the reported “virus” issues (issues which don’t exist, BTW) , badly solves a problem that hasn’t existed for a decade, and badly solves the problem in a way perfect for collecting personally-identified metadata.

As for Meta and Facebook more generally, they’ve been making money from questionable activities and scams, per reports.

• https://krebsonsecurity.com/2024/09/scam-funeral-streaming-groups-thrive-on-facebook/
• https://techcrunch.com/2024/03/26/facebook-secret-project-snooped-snapchat-user-traffic/
• https://arstechnica.com/tech-policy/2025/11/bombshell-report-exposes-how-meta-relied-on-scam-ad-profits-to-fund-ai/
• https://finance.yahoo.com/news/meta-earned-16-billion-scam-121500409.html
• [many others]

Problematic Facebook Marketplace purchases are a popular topic around here too, with folks purchasing lost or stolen (and useless) devices from there, and from other similar online markets.

At some point, I would wonder whether what is not a scam on the Fcebook website is worth wading through the ads and the scams and the fraud and the propaganda.

Of course it is a scam.

The fake storage graph showing that "viruses" take up about a third as much storage space on the phone as your apps is an especially "creative" touch.

Note also that the scammers could not spell "Apple Security" correctly. They wrote "Apple Secutiry."

Step 1 may be to "Install viruses removal app for free," but I bet when this app "finds" "viruses", it will tell you that you have to pay to remove them. And even though iOS sandboxes apps, I would not want to install whatever app the scammers are promoting on my phone.

The messages are scam attempts, presented by criminals. Do not interact with the message or the sender. For information from Apple regarding such bogus messages, please read the information at the link below. 

Recognize and avoid social engineering schemes ... - Apple Support

a good indication would be that the mail shows it was sent from the domain mellicator.com

why would facebook use such an email address to send mails indicating being from apple telling people they had viruses , which is something a website or even apple or facebook as corporations would never have enough access to your device to tell if you had.

also only way to install any type of software vira, malware and the likes on a non jailbroken ios device is apple app store, so links, mails, sites, or whatever can't install software on your device.

Of course it is a scam or more specifically an Ad you found on Facebook to try and get you to download and/or subscribe to a service you do not need or want. Yes, there are Facebook users that a paid a commission as an "affiliate marketer" to get others to follow their links. To be fair, they are not just found on Facebook.

As NO ONE, not even Apple, can “see” or “detect” what is or is not on your device without your express permission allowing remote access, any message saying they found something is bogus.

Actually, a really good indication that it's a scam is that it came up of Facebook...