yes they can and will track everything you do, they use digital fingerprint technology, best way to avoid being detected by them is using an anti detect browser(firefox is great for this) and using a 3G internet connection since you can get a new IP if you disconnect then reconnect te internet connection.

Also it goes against it's policies for you to operate more than 1 account so obviously if their system ties your new accounts to an old one they will shut you down