In August 2005, thefacebook was officially called Facebook and the domain facebook.com was purchased for a reported $200,000.
Facebook launched a high-school version in September 2005, which Zuckerberg called the next logical step.At that time, high-school networks required an invitation to join. Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. and Microsoft. Facebook was then opened on September 26, 2006, to everyone of age 13 and older with a valid email address.