Batara Eto (衛藤バタラ Etō Batara?), formerly known as Batara Kesuma, is the co-founder and Chief Technology Officer (as of 2007) of mixi, a Japanese social networking site. He is currently founder and managing partner of East Ventures, a VC firm focusing on Japan and South East Asia.
He proposed mixi in December 2003, and was responsible for creating the corporation. He is also well known for advocating the use of the open source LAMP stack. Batara changed his citizenship to Japanese in March 2007, hence changing his last name to Eto, which is passed down from his grandfather who was originally from Japan.