No question. The results from most FB campaigns, for legitimate companies, do nothing. FB is not able to make the connection from advertiser to consumer whatsoever.
If you are giving something away for free, maybe, but sales or sales inquiries from cars to food, on FB buy is nonexistent.
This is why FB is now "cracking" down on fake accounts and likes on pages will fall on average by 1.5% as fake accounts are deleted. This is a smokescreen to punt the issue to fake users as the cause of their ad failures.
So don't waste your time on advertising on FB unless you are running a contest, giving something away for free, etc. waste of money.