https://techxplore.com/news/2021-03-facebook-accused-money-ads-fake.html
"Facebook, which in 2019 paid advertisers a $40 million settlement over inflated video-viewing metrics and is fighting a lawsuit over its "reach" to users, is now taking flak over its revelation this week that it took down 1.3 billion fake accounts during just three months last year."
#25 Google does the same kind of fraud as did Twitter.
Fake from number of users (stock fraud) to number of viewers (more fraud).