This is exactly the reason why everyone needs to quit Facebook and get on steemit.
They all steal our information and sell it off to whoever bids better, whatever I check out on an online store immediately appears on my Facebook page the next time i login as ads.
DEcentralization OVER everything.
But that is just simple cookie reading by some ad network, like AdSense. There are tools to block it, if that anoys you.
Thanks.
Please how do I block it?
AdBlock is #1 tool for this purpose