twitter / facebook geographic site

Hi bidders I want a site where people can sign in with their twitter or facebook account. By signing in they can sign up to the site, and now they can set what country and city they come from. That they can do either by signing in with their facebook account, or twitter account or both. After they have done that, people can see their updates from their accounts on the site. By tapping in their country, other people can see their updates if they search after that specific country. So if a users go into www."sitename".com and type in that he/she want to see recent updates from usa, he will only see facebook and twitter updates from people from usa. The same thing happens when they type in country and city, - he will only see updates from that specific city. More info will be sent to the winning bid. Hope my post sounds clear of what I want. Mads Pedersen