Facebook has 500million users

Facebook founder and CEO Mark Zuckerberg said there is a "good chance" that the social networking site could boast one billion users within three to five years.Facebook officially has 500 million users, the company announced Wednesday. The milestone means that the six-year old website now reaches eight percent of the planet's population, just 18 months after it passed the 150 million user mark. Facebook marked the milestone with the launch of a special section in which users are encouraged to post their personal stories about how Facebook has affected them.Instead of focusing on numbers, we want to help people around the world hear about these stories for themselves, and we want to let you tell your own story