Selam. I have a question. My friend told me he knew one of my friends. I want to ask him, where from? Can I use nereden?

Thanks, Teþekkürler. ! PM me or just reply to the bulletin.

Yes, you can use it.

ok tþk harpoon!

Can I use this topic for my question also?

why in this sentence they use niçin, for me neden would fit better?

O niçin Türkçe konuþmuyor? Türkçe bilmiyor mu?

I think there´s a very thin line between those words sometimes.. and not always an explanation why one word is used and not the other..

I think I´d prefer "neden" as well. But niçin isn´t wrong.