GROUPME
GroupMe is a group texting and conference calling service that lets you stay in touch with groups of people via mobile phones. The service allows you to effortlessly group text with the people in your life that are important to you. It's totally free and works on every phone. New York-based GroupMe was founded in 2010 at the TechCrunch Disrupt Hackathon. Investors include Khosla Ventures, General Catalyst Partners, First Round Capital, Lerer Ventures, betaworks, SV Angel and more.