or a lot of people using other social networks. Or a lot of people that don't know they "need" social networks. Or a lot of people that can't use social network

or a lot of people using other social networks. Or a lot of people that don't know they "need" social networks. Or a lot of people that can't use social networks (eg grammas and grandpas, 12-year-olds, people in countries where FB is blocked...)