4 ms·

Another hypothesis is that Facebook had been showing you the barbeque sauce ad all along, which is why you bought it. You only noticed afterwards.

• brianpan 14y ago
  Or more likely to me, the barbecue sauce company recently launched a marketing campaign that influenced you to buy one (and the campaign is continuing on Facebook where you see it now).
• gcr 14y ago
  Facebook also might know that the store only sells one brand of barbeque sauce.