Google and Facebook have particularly not-great privacy reputations because they are advertising companies whose business models are precluded on collecting your personal info.
Counterintuitively, you are more likely to be better at privacy if you are in the business of selling data, especially in the current regulatory climate.
The websites that have been the worst at maintaining my privacy were those that primarily sold physical products or medical services. You'd be amazed how many organizations broker data now.
