Depends what you mean by broadcast:

1.    At the physical level it is a non-directional radio signal and hence
is broadcast - a blueband device can poll all the surrounding devices.
2.    At the next level up in the stack it is a point to point protocol and
not a one-to-many protocol.  It is not possible as far as (I am aware) to
broadcast a stream (e.g audio data) to multiple receivers over a single
Bluetooth adapter.
3.    At the application level it is possible to broadcast objects by
polling all the surrounding devices and sending files to those devices that
support the Object Push Profile or any other Profiles built on the OBEX
protocols.

Hi,

Bluetooth has always had support for something called a 'Broadcast
Channel', but it has never worked properly so unless you are designing
all the devices you wish to broadcast from and to, you have no chance of
interoperability. :-(

The biggest problem is the need for retransmissions that you will need
if the device listening to the broadcast recieves a corrupt packet.

pzboyz.