Can a hacker find out who the anonymous person on Ask.fm is?

And How can I prevent the hacker from finiding out it's me? I used my Iphone and I switched it off for now so what else can i do?

Real hackers don't mess around on sites like that trying to find out who anonymous is. They are busy hacking credit cards and bank information. Somebodys just feeding you a bunch of garbage and they won't find out who you are unless you tell them.