Unique Mobile Bluetooth Application

Hi All Im looking for one more mobile application for development that is part of a large mobile program. First of all - I should say I have no Idea if this type application can be developed ,, but hoping it can Basically - I am looking for an application that enables one mobile phone to "poke" another mobile phone via bluetooth without knowledge of the other mobile phone number - The poke would not be any different to an online social network poke .. with a message as simple as Hi ... There might likely need be an application developed for this ,, that can be downloaded to the mobile phone to handle this communication if its possible to develop .. My objective for this application to run on all phones with Blue tooth enabled. If you have the skills and a method to enable this application, I want to hear from you Thank you