2005, let s call that the year of its adolescence. it expands into high school networks. that s how you joined facebook, you had to be part of a high school network or a college network. they added the photo application which by the way today makes facebook the biggest home for photographs on the internet and by its year of adolescence, 2005, it already had 5.5 million users. and 2006, let s call that the year of acceptance. it expands to work networks, so you could be a member if you were from a school, from a college or from a place of business, and it allowed anyone to join. so, you didn t actually have to be a part of a network in order to join. look at that. it jumped to 12 million users. let s go to 2007, so this was the year of acceptance, 2007 became the year of accessibility, because facebook went mobile. that s where you could get it on your on your phone, and you could you could update your status from there. microsoft invested $250 million in the company, and by 2007, 5