Default [help] location post facebook

hello ,

i have sumsung omnia w 7.8 interop unlock with wp7 root Tools,

i have the latest version of Facebook, but when i speak with my friend in Facebook it does not show where am i , i give exemple: i want send message and in the end of my message i want see this: ( message sent by mobil from roma ).

thanks a lot of, and sorry for my English