Facebook/antivirus
Interestingly, Facebook forces users to submit to having their computers scanned by ESET:
https://community.norton.com/en/forums/i-have-been-blocked-logging-facebook-it-claims-i-have-malware-and-must-add-eset-program-scan
ESET also now happens to be part of Googles Chrome browwser "cleanup":
https://www.theregister.co.uk/2017/10/16/chrome_for_windows_malware/
Also, many developers use the Facebook Graph API to post comments to Facebook as the actual user using the users Facebook access tokens:
(1) “****** Antivirus just saved my computer from infection! Try it now. It’s free.”
(2) “My ****** Antivirus just updated, with powerful new security features. Download it for FREE. You’ll love it.”
(3) “I just installed ****** Antivirus for free. I really like it. If you want the best protection, download ****** like I did.”
How easy would it be for a developer to abuse the Graph API to post comments that could be determined to be hateful or divisive?