Yep just used to keep your login info. If you don't want to use cookies, go to user CP and turn it off. Please don't cause alarm to all members and guests about cookies, when nearly every single site on the planet uses them. TF only uses cookies for keeping track of login account information. If you want to login each time, then that is ok. There is no other "spyware" or any other software that is monitoring your activity, your computer, applying viruses or anything else.
If you have any future concerns, please email me or any other moderator directly. I thank you, Johnray.
Andy