FB made $6B in revenue in Q4 2015. LinkedIn made $862M in Q4 2015. Given the ultimate size of the global digital advertising market, it seems that there is much

FB made $6B in revenue in Q4 2015. LinkedIn made $862M in Q4 2015. Given the ultimate size of the global digital advertising market, it seems that there is much more growth potential in expanding share of advertising $$ than trying to expand to brand new businesses.