Social media platforms are used for one-to-one communications and should support that. Furthermore, social media platforms should support sharing something with

Social media platforms are used for one-to-one communications and should support that. Furthermore, social media platforms should support sharing something with a group and only that group of people. Really, the only time I should expect the content I share on a social media platform to be public is if I shared it as public content. [Note that I am talking about technical capabilities and privacy here. Of course somebody with whom I shared private information can re-post it publicly, but solving that is out of scope for a technical solution - and is also true outside of social media platforms]