Differences between facebook ads clicks and GA clics

There is a big gap

[bobrock4]

These are clic on facebook ads and the same clic tracked on google analytics. Apart the first all rows see big differences between what facebook shows and make paying on its adv platform and GA.

clic fbk clic GA from fbkclic fbk +/-clic fbk +/-%
94 114 20 21%
406 199 -207 -51%
291 64 -227 -78%
239 49 -190 -79%
146 54 -92 -63%

Conversions are also bad.

What do you think? Thanks

[keyplyr]

The only way to get accurate data is to view your raw server logs. GA misses too much.

I have no idea what FB Ad reporting counts, but I know that other FB reporting ("your page was viewed __ times") is inflated from my experience.

[bobrock4]

AdWords cllicks are not so different in GA. I understand AdWords is another Google product, but my FB data are so few...