Facebook

Mark Zuckerberg launched the first version on the 4th of February 2004 and it was actually called "thefacebook".
Initially it was only available for Harvard University students but was quickly opened up to include other US universities. 
There were only 8 features:
1. User accounts (with real names required), restricted to @harvard.edu email addresses
2. Friends, including friend requests 3. Invitations (no contact importer; you had to enter each email address individually)
4. Profiles, with a single photo for each user
5. Ability to list user metadata like gender, birthday, dorm, phone number, favourite music, favourite books, "about me," courses (structured)
6.Search by name, class year, courses, other metadata
7.Some privacy restrictions to limit who could see your profile (friends only, only people in my class year)
8. A feature to visualise a user’s friend graph, which was later cut
Your task is to find out two other facts about Facebook for me and "email!"me your answers rather than posting a comment.
1. Why was the colour blue chosen?
2. On what date was facebook opened up to the general public?