I don't know what the conversations around FB's early investment were like, or if expanding to a billion users was always part of the plan. My understanding is that very early on (i.e. the first six to nine months after it started) they wanted to be a kind of information hub for school campuses, with course listings and whatnot.
Even if that's true and they pitched investors on a kind of online campus hub for students, they woukd still have been going after a pretty big market - they could sell software/functionality to schools and/or they could sell advertising (reaching young people is quite valuable for brands since young people tend to have less fixed opinions and loyalties as consumers).
It may well be that investors thought it could grow to compete with MySpace. Others might have just thought being an essential part of every student's life would be a good enough outcome. (After all, there's plenty of VC in "ed tech" these days).
Even if that's true and they pitched investors on a kind of online campus hub for students, they woukd still have been going after a pretty big market - they could sell software/functionality to schools and/or they could sell advertising (reaching young people is quite valuable for brands since young people tend to have less fixed opinions and loyalties as consumers).
It may well be that investors thought it could grow to compete with MySpace. Others might have just thought being an essential part of every student's life would be a good enough outcome. (After all, there's plenty of VC in "ed tech" these days).