Local Chat Room website

I know there are many scripts available and it may be necessary to have one written or customized for my propose. I am looking for a website where a user can create a user account with an option profile and location (zip code). Users can search for others within a radius of their zipcode (I can provide a US ZipCode DB with long/lat information for distance calculation) They can also search for user by matching keywords for common interests. Users may also just look for current "rooms" based upon descriptions and enter chat rooms locally based upon topic. Simply stated, I want a site where users can like up with local parameters (nearby zipcodes) and common interests. Users can char in common rooms or have private chats. Private chats should enable voice or possible video feeds. Users should also be able to block other specific users from finding them online (prevent stalking). Is there such a script in existence or can something me modified for this purpose. Thank you for your input/bids. Please share your thoughts on scope of project, possible solution or how you think this can be done. I can find many Chat scripts available and it may be easiest to modify one for "local" searches based upon user zipcode. Let me know your thoughts.... I am open to suggestions. Dan