Social networking sites have become popular for several reasons: 1) They allow users to meet new people from around the world; 2) Popular sites are easy to use and navigate, even on mobile; 3) Users can join groups with people who share their interests; 4) Most major sites like Facebook and Google+ are free to join and use; 5) Social media plays a large role in online job recruiting and searching; 6) Businesses can effectively target advertisements to potential customers using social media profiles and information.