I think just visiting certain webpages can do it , but i think you may have to download something from the page to get it into your system but im not sure if you can get then by just clicking something simple like "CLICK HERE TO MAKE THIS YOUR HOMEPAGE ECT" but someone else here might know alittle more about how easy or hard it is to avoid getting it on your system
(ocultar) Si necesitas encontrar un mensaje antiguo de un determinado usuario, pincha con el ratón sobre su Perfil y utiliza el enlace de la parte superior de la página "mostrar todos los mensajes del usuario". (konec) (mostrar todos los consejos)