How to write FQL for wall fetching values in iphone

I am integrating facebook api in my 开发者_C百科application. I can login perfectly and able to post text on wall. I want to trace my all wall values. I am seeing a query is written in my application which is

NSString *fql = [NSString stringWithFormat:@"SELECT actor_id, message FROM stream WHERE source_id = %lld  limit 50",_session.uid];

but this query is returning only those wall value which is posted through the application.

Can anybody help me, how to get wall posted values by FQL and also where can I get FQL statements different queries ?

Thanks in advance

---

You can refer to this post of SO.

For other list of FQL queries you can follow this.