Friends on android when your iOS???

So I have a couple of friends playing hay day on android but I'm on iOS. Is it possible to friend them???

It is possible if you all use Facebook.

I have a neighbor that will change to android can we still be neighbors? Can I still see what he is selling? And can we still trade if I don't have Facebook?

If they are on an android they need link it through facebook and then on you iso, you need to connect to fb in order to see each other. My husband plays on an android and if my ipad is not connected to fb, I can't see him.

Ya, I think only both of U can see each other when U're connecting with facebook.
I think there is no others way to connect IOS & Android players except for linking to facebook.