A new tech support scam trick is underway that utilizes Facebook’s Sharer dialog to scare a user into thinking that their Facebook account has an issue. The scammers are now utilizing low quality ad networks commonly used by adware and unwanted software to redirect visitors to the Facebook Sharer page in order to share a page from fbsupport.pro. If a user is logged into Facebook, it will display the Share on Facebook dialog with a scary warning from the “Facebook Support Team”” stating that “”We’ve registered a suspicious activity on your page”””
Source: https://www.bleepingcomputer.com/news/security/scammers-use-facebook-sharer-page-to-push-tech-support-scams/