facebook connect for my wordpress site classipress theme

I have a wordpress site using the classipress theme. What i need is facebook integration (and possibly twitter). what i need is facebook connect (possibly the twitter equivalent) to allow people to sign up for my site instead of manually signing up. also if they use facebook/twitter to sign up and create an ad posting I need the ad they created on my classipress site to show on their facebook profile and friends newsfeed. I'm also wondering what type of demographics I can collect from people when they sign up through facebook as well? age/sex/location/etc. Please bid based on just implementing facebook connect. But then I would appreciate a msg including price for twitter integration. also please fill me in on the demographics I can request. Only bid on this if you have experience with facebook connect/wordpress/classipress.