Throttle Linkage Lube??

Just wondering...Is it okay to put greese or like WD40 or Silicon lube on the throttle assembly on the throttle body...just like on all those moving parts and springs. i wasnt really thinking of greese. but maybe WD40 or Silicon Lube...What do you think? Is it supposed to stay normal like it is. or what. it feels a little rough...like some drag on it...but i dont know if thats normal or what. plus im afraid of it sticking...