Wondering How to Make a Startup? Follow the 12 Biggest in the Business by InsiderMonkey.comAugust 22, 2013April 15, 202001159 No. 1: Twitter Funding date: 09/08/2011 Funding round: $800 million Valued at: $8 billion Investors: Digital Sky Technologies 1 2 3 4 5 6 7 8 9 10 11 12 13