[akinity]

You do but privacy policies and what who can see on whose time line keeps changing. Timelines haven't always been a thing either. So if you've used facebook for a while, the incoherent and mercurial scope of information prevents you from wanting to share anything that could be misinterpreted by anyone. And you have to assume that everything will be scraped somewhere for all of eternity.

[AJ007]

Facebook has messed with the privacy settings enough that people who are watching what they are doing don't trust them. For people who aren't paying attention, the privacy settings are too confusing to trust.

Snapchat? Recipient views picture once, and if they try to save it you know.