I've spent mid six-figures on Facebook CPC ads over the last several years and can definitively say that they work very, very well - depending on your use case. Mine is not the OP's use case (though I've sold a metric a-ton of SaaS on FB).
I advise everyone here thinking about FB ads to do the following:
- If you try it, dedicate a serious amount of money. Nothing less than $500 will suffice as you need to get statistically significant data across all your targeting sets.
- Focus very narrowly on your target market. Trying women age 22-29? Do that in your metro area only. Keep your targeting sets small so you have fewer variables to contend with.
- Don't lose your nerve. If you give up too quickly you'll know nothing.
Finally, I do understand the OP's frustration with click numbers from FB vs. GA. Don't let it get you down, as this is common on every platform. Optimize for your actual logged data and you'll profit.