[akersten]

No, I really don't see the difference, because the service here is the product. The service is not a place of accommodation like a skate park.

"Company makes thing, people do bad with thing, hold Company responsible" is a scary line of thought, and that's exact same scenario for both Facebook and guns.

"Thing hurts person using it" is closer to your skate park analogy, and yeah, in that case, of course Company should be responsible for making a bad thing.