Businesses don't take it seriously because people don't actually care. Some do. The vast majority don't. They might say so in a survey, but at the end of the day, Facebook (and companies like it) will continue to survive doing what they always have been and people will continue using those services.
That's the root of the issue, though. People really don't care as much as posters on HN think they do. If we could acknowledge that, I think we could come up with better solutions.