I am experiencing problems when importing the comparison data from Facebook, is all set to 0. I attach you a screenshot
Do you know how can I solve it?
this is most likely related to the fact that you're splitting your results with a date, which makes the comparison almost impossible to accomplish. Comparison features work best is you don't have any date related split by values selected in your query.
But you can also use them with certain date related dimensions, like in this example: