Perhaps don't read it as "raised" but "was given". Giving away 4% for $200M seems like a fairly slick deal for a company with no revenue(?) yet.
OTOH, in 2012 Twitter spent over $250M on staff and R&D. Pinterest is nearing(?) that size of application (perhaps more as Pinterest has more photos than Twitter had), although Twitter had many more employees then (I think 1500 or so compared to "140+" WP says for Pinterest). Billions is a hell of a lot to share some SMSes.
OTOH, in 2012 Twitter spent over $250M on staff and R&D. Pinterest is nearing(?) that size of application (perhaps more as Pinterest has more photos than Twitter had), although Twitter had many more employees then (I think 1500 or so compared to "140+" WP says for Pinterest). Billions is a hell of a lot to share some SMSes.