At what stage in its existence was Facebook in any way open? It was a walled garded from its inception - initially restricting access to college students only.

At what stage in its existence was Facebook in any way open? It was a walled garded from its inception - initially restricting access to college students only. In fact I never did and still do not consider Facebook as "the web". There is the web and then there is Facebook. The two just use similar technologies but live apart.