Facebook's mission is to give people the power to share and make the world more open and connected. Millions of people use Facebook everyday to keep up with friends,
upload an unlimited number of photos, share links and videos, and learn
more about the people they meet.
Twitter connects businesses to customers in real-time. Businesses use Twitter to quickly share information with people interested in their products and services, gather real-time market intelligence and feedback, and build relationships with customers, partners and influential people.
Foursquare is a free app that helps you and your friends make the most of where you are. When you're out and about, use foursquare to share and save the places you visit. And, when you're looking for inspiration for what to do next, we'll give you personalized recommendations.