[newbie] Linux - Spyware

[Ricardo Rodriguez Peralta]

As a newbie, is not much what I really know about overall linux security regarding virus, spyware and those threats but somehow I though my box shoud be spyware-free.

I'm surprised to see that some clicks or sites show the 'doubleclick' address when accessing let's say yahoo mail for example.

Are we (linux users) also exposed to spyware? how can you really take control of what info is going out from our pc's? how do we get infected with spyware and what will be linux alternative to fight it?

I know some anti-spyware for Win, for example: MS, yahoo, spybot, etc.  Do we really have to be concerned about it under linux?