There is privacy in the bedroom because we expect there to be.

On social media, we share (and over share), and yet we are shocked at our privacy being exposed. We should not expect it.

If we talk quietly to each other in the privacy in our homes, sharing that information is a breaking of social trust.

If we talk on the bus around others, we should't be too surprised if someone hears us.

If we share what we say to all, we should absolutely not be shocked. Especially when we are explicitly sharing on purpose.