189403 PHP invitation module

For a live Joomla based news site I would like a recommendation system. Two things on the wish list: * adding a 'Friends read...' script to an existing, self-written module where the 5 news sources are shown that registered friends read (Community Builder based) * adding the option to search for friends on the website by importing Gmail, hotmail and/or outlook adress books. If contacts are already registered they can be added to the friends list, if not it should be possible to invite them through email. The current site is in Dutch, but I can translate the code and comments.