andyt andyt:
So how does the bank monitor your activity? contact your ISP?
When you open their site, they run a 'script'. Part of that script is to translate their record to the pretty display you see on the screen. Part of the script will also do things like send your browsing history back to them, and send you email contacts to them as well.
Some websites, like CKA, run other scripts from Facebook.net or Google Analytics that do the same thing, and share data with 'partners'. Facebook.net's scripts are one of ones that can track pretty much everything you do on the web.
That's why one day you can look for a widget, and the next day every damn website you go to has advertisements trying to sell you widgets. The internet used to be about sharing ideas and information, now it's mostly just another way to part you from your money.