Is this a coincidence ?

After not eating breakfast cereals for a number of years, this week I bought some sultana bran.

Very mundane,old fashioned cereal. I scanned my woolies card at the checkout.

I have noticed in the last couple of days adverts for Sultana bran appear wile on Yahoo, on Gumtree etc..

never saw them before..Am wondering if the woolies card and the inetrnet share the info ?

I also saw some adverts on Hotcopper for items I had searched for on google.....

Are we being observed that closely???