Hi, this forum has given me some knowledge in past, so I am kind of giving it back.
I have used this way to get web site traffic to sell some Forex related stuff in year 2016 and 2017
Below are my results.
1/- Facebook traffic is not good, only free loaders plus junk traffic.
2/- You get a high bounce rate of around 60% to 70%
3/- Face book keep becoming smart and keep blocking accounts for 3 months, ask for I.D and mobile number sms verification etc..
4/- It may worth to use web site traffic to earn money via Adsense but for how long? Google is more smarter than Facebook.
5/- The traffic I got only consumed my web site band width and almost zero sale per month.