I don't think it was totally open to the public until September 26, 2006.
From en.wikipedia.org
The company dropped The from its name after purchasing the domain name facebook.com in 2005 for $200,000.
Facebook launched a high school version in September 2005, which Zuckerberg called the next logical step.[34] At that time, high school networks required an invitation to join.[35] Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. And Microsoft.[36] Facebook was then opened on September 26, 2006, to everyone of ages 13 and older with a valid e-mail address.
From en.wikipedia.org
The company dropped The from its name after purchasing the domain name facebook.com in 2005 for $200,000.
Facebook launched a high school version in September 2005, which Zuckerberg called the next logical step.[34] At that time, high school networks required an invitation to join.[35] Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. And Microsoft.[36] Facebook was then opened on September 26, 2006, to everyone of ages 13 and older with a valid e-mail address.
