Facebook and other websites "following" me?

[Existential Blues]

I've noticed that Facebook, Amazon.com, Myspace, and other websites advertise things I've recently looked up outside of their websites. How do they know what I've been looking up? Isn't this illegal???

[Daniel Y]

no its because u are typing your current city or ur hometown and so they track that and they say that

[golfgirl3]

They have monitors that watch your every move, you better not answer the door the next time it rings or there is a knock at it.

[Kehon H]

unfortunately this is not illegal and they do it thru the use of cookies so every time you goto a website it adds a cookie and then when you go back to facebook or myspace they check to see what cookies are there and advertise accordingly. They get paid each time you click on a link so it's better for them if they put stuff on their sites that you might want to click and see.