It's a good question. By garbage here I mean their entire existence is based on wasting people's time and then making money by showing Ads. Their entire incenti

It's a good question. By garbage here I mean their entire existence is based on wasting people's time and then making money by showing Ads. Their entire incentive structure is to get people as addicted as possible. They are not trying to add value to the world. Also, most people aren't aware of the trade-off they are making (data being sold), or how they are being manipulated, which makes it doubly terrible. Or that there are armies of behavior psychologists trying to get them to spend as much time as possible on the site. "Good" is a sliding scale here, we each have our own subjective definition. I try to define it as "Is the world a better place because this company exists?" I personally would answer Yes for the companies you listed.