Why do people give shout outs to their favorite celebs ?

I've noticed alot of people give shout outs to their fav. celebs in their questions/ answers,

for example, in one question some girl was just like : I love you Nick!!♥
and in another some other girl was just like : wooooo! I love you miley! you rock?


Why do people do this? Do they think they're gonna see it??

(I'm not dissing, I'm just asking.)