I know this has been talked about previously but how do the ads >> know what you've been googling?
Today I'm getting Inov8 mudroc ads - pretty specific and I was looking for them last night but I was looking on an iPad and here I am on a PC. How are they connected? And how does it differentiate between things I might buy and things I'm just interested in finding out about? And I've not had that T-shirt one for ages