[Qt] Need help in transferring a file using Email/Bluetooth/Social Network ...

Hey guys, I need some general information on how can I use Qt to send a file using email or bluetooth or a social network already defined in the N900 (e.g. facebook) ..

Regarding bluetooth, I read that Qt doesn't provide any libraries, and you would have to use Qt Extended, or use the default Maemo libraries ...

I also know that for general phone functions, a DBus can be used to perform the necessary functions .. I need help in fully understanding this DBus concept and how to use it to transfer files ... And regarding uploading a file to a social network already defined in the N900, I have no idea ...

Any general help on these three points would be really appreciated .. !