3. Instagram: Created by Kevin Systrom and Mike Krieger, and launched in October 2010 exclusively on iOS. A version for Android devices was released in April 2012. 4. LinkedIn: Founded on December 28, 2002, and launched on May 5, 2003, it is mainly used for professional networking. 5. Snapchat: Released by Evan Spiegel, Bobby Murphy, and Reggie Brown, former students at Stanford University, in September 2011.