Finding friends that use your app

[Ricardo Marinho]

I don't know if this is the right place to make this kind of
question, but I want to know if there is a way for me to find out
which friends use the aplication that I'm developing. For instance,
I'm developing an aplication that send messages for my friends, but I
just want to send those messages for who have the aplication.

I don't know if I was clear enough and sorry for any mistakes in my
text, I'm a brasilian guy, so it might have there!

tnks!

[Mark W.]

You might try a query on your friends and return the hasApp field.