Yes, I know a user who did, her name is Jennifer, but her username is THEDisneyFreak. But it took me several months to get a dedicated and a hundred fans.
A dedicated medal, yes. I got one. A hundred fans, maybe. If you fan a lot of people.
I don't think I have a hundred fans, but I'm not worried. Having many fans aren't really important. Add the people you get along with, that is my advice.
I have been here over five months and don't have 100 fans yet. XD I got my dedicated medal in about two months. I think THEDisneyFreak and Gus (the guy above me) are the only one I know who got a dedicated medal in a month.
I got die-hard medal in just one day (I donno how) and fanatic in a month. But I post stuffs in only those in which I am interested in to earn medal. And yep it's easy to get 100 fans within a month. But you need to do a lot of hard work (which I can't because I am too lazy)