What is ask.fm? Do they have moderators, like here? If they do, report the question if it's bothering you so much. Or, you could let it go & move on to questions that aren't "very nasty." If you reeaally feel the need to answer, just be polite about it. "Your question is inappropriate, I shouldn't answer it because you're being very nasty, but.........." -- fill in your answer there. :)
say, ur Q. is inappropriate 4 users like me so i'm ignoring it..or if u wana answer say it but politely if u don't wana be mean. btw i just visited ask.fm and it asks me 2 join.Is it a safe one? pls say , is there any risk if i join it?