This seems to be an all too common problem as of late. Here is a previous reply fromTM:
Hello moff1959 and welcome to the Community!
Thank you for letting us know about this question that youhave in mind.
This message from the link you clicked on Facebook is a Technical Support Scam. It is a scheme used by cybercriminals to scare you bydisplaying a fake message on your web browser to make you believe that there isan issue with your computer when there's none. If by chance that you will getto encounter this kind of message again, please do not call the numberindicated on the page.
All you need to do is to get rid of the message on your webbrowser. Please follow the article below for the instructions on how you canreset your web browser:
Resetting yourweb browser
I hope this helps!
Should you have any other concern, please let us know.
Have a great day!