The Google and AirBnB references seem on point, but were people skeptical of Facebook being a good idea? Sure there were naysayers who thought Facebook couldn't beat MySpace or break out of the college campuses, but people did love Facebook pretty early on and weren't hating on the product (it was "cool").
The 0th version of facebook was literally "illegal stalking as a service." Outgrowth from that, and from ignoring the "we're accessing your systems illegally and you can't stop us" part, grew the horrible monster choking the Internet today.