The project began to develop rapidly. For further development of Facebook, Mark Zuckerberg stared looking for more investors. Accel Partners invested 12.7 million dollars in Facebook in may 2005. By October 2005, the registration was opened to all students. The main condition was the availability of an email address in edu zone, which also indicated a person's belonging to the education sector. Then in December the same year, there were 5.5 million active users of Facebook