SINA Corp was founded in March 1999 through the merger of Beijing SINA Information Technology Co Ltd. and California-based SINANET.com. In April 2000, the Company completed the initial public offering. The Company is an online media company serving China and the Chinese communities. The Company's digital media network of SINA.com (portal), SINA mobile (mobile portal and mobile apps) and Weibo (social media) enables Internet users to access professional media and user generated content ("UGC") in multi-media formats from desktop personal computers and mobile devices and share their interests with friends and acquaintances. SINA.com offers distinct and targeted professional content on each of its region-specific websites and a full range of complementary offerings. Over the years, it has built a broad content network with thousands of professional media partners and accumulated a mainstream user base, including well-educated, white-collar professionals. The Company's mobile portal, SINA.cn, provides news information and entertainment content from SINA.com customized for mobile users in WAP (mobile browser) and mobile application format, such as SINA News, SINA Sports, SINA Finance, SINA Entertainment and SINA Blog. Weibo is a social media platform for people to create, distribute and discover Chinese-language content. Based on an open platform architecture, Weibo allows users to create and post feeds up to 140 Chinese characters and attach multi-media content, as well as access organically and third-party developed applications, such as online games. The Company offers both brand advertising services in display ad formats on SINA portal and Weibo, as well as performance-based online marketing solutions on Weibo, such as promoted feeds. SINA.com offers a variety of free interest-based channels that provide region-focused format and content. The popular channels include: SINA Sports, SINA Auto, SINA Finance, SINA Entertainment, SINA News, SINA Technology, SINA Digital, SINA eLadies, SINA Luxury, SINA Collectibles and SINA Video.