Airbnb Quora Foursquare Facebook Airbnb could soon be a billion dollar a year business, explains Business Insider.  Every time I get ready to write about Airbnb they have more news.  This past November, Airbnb announced Airbnb Neighborhoods and also Local Lounges.  In December, Airbnb acquired Localmind, a popular local question and answer app that’s been described [...]