Customized Internet Messaging Program Needed

Please forgive the lack of technical terminology and specs ??" I am not a technical person and this is my first foray into putting together a website.? ? What I need is an internet messaging program for my website with the following characteristics: ? 1. People would message each other using multiple identifiers, including e-mail addresses, cell phone numbers, Facebook or Myspace page URL’s etc.? 2. When Person 1 sends a message to Person 2, the message does not go to P2 until P2 sends a reciprocal message to P1.? At that point they both receive each other’s message.? ? I realize this is very cryptic.? There is a purpose which I don’t want to disclose to the world and if you are interested in this project we can discuss and I will fill in the gaps.? ? This project could turn into substantial additional programming work, as this program is just one single step on the path to launching this website. ? Thanks for your interest. ## Deliverables I am not a technical person (unfortunately) so the bulk of this project and it's parameters will have to be worked out through communication.? I estimate this project will be in the medium to large range in terms of scope.? Please only bid if you don't mind working with a total novice/amateur. Thanks in advance.