Google Inc. is an American public corporation specializing in Internet search. It also generates profits from advertising bought on its similarly free-to-user e-mail, online mapping, office productivity, social networking and video-sharing services.
谷歌公司是一家专攻英特网搜索业务的股份公司，也会在为用户提供的电子邮箱、在线地图、办公应用以及视频分享等功能中通过广告业务获得收入。

Google has more recently developed an open source web browser and a mobile phone operating system. Its headquarters, often referred to as the Googleplex, is located in Mountain View, California.
谷歌还开发了网络浏览器以及手机操作系统。谷歌公司总部坐落在美国加利福尼亚州的山景城。

As of March 31, 2009 the company had 19,786 full-time employees.
到2009年3月31号为止，谷歌共有全职员工19786名。

Facebook, Inc. is a company that operates and privately owns social networking website, Facebook. Users can add friends and send them messages, and update their personal profiles to notify friends about themselves.
Facebook公司（暂无官方中文名）致力于打造一个社交服务网站。用户可以添加朋友并发送信息，通过发送自己信息来让朋友们了解自己生活。

Additionally, users can join networks organized by city, workplace, school, and region.
在Facebook上，用户还可以加入各种群组，包括城市、公司、学校以及社团等。

Twitter was produced in March 2006 by Jack Dorsey and launched in July.
Twotter是由Jack Dorsey创造于2006年3月并于同年7月成立的。


Since then Twitter has gained popularity worldwide and is estimated to have 200 million users. It is sometimes described as the "SMS of the Internet".
自建立起推特已经在全球范围内吸引了2亿多位用户注册。推特常被描述为“因特网的短信息”。