@vasta @smokey re. Social groups based on context – I think my first brush with this was when FB purchased Instagram.
Prior to this, my Instagram “friends” was just a list of fellow bullet journalers and fountain pen addicts. My timeline was full of stationery porn.
Then FB intruded and I had RL friends commenting on my posts, asking me why my timeline was full of pen and ink pics. It was most jarring when I was live streaming an ink review and I had RL friends log on asking me what I was doing. 😩