One of the things that digital intermediation devours from social interactions is partial visibility (especially transitive visibility) outside the digital space (and often within it, but that's dependent on the social software and the impact is much more varied).

Glancing passively toward someone reading a book, versus watching a movie, versus chatting with someone else, all give quite different impressions. Glancing passively toward someone reading with the Kindle app, versus watching Netflix, versus chatting on WhatsApp, all on the same handset—you don't get nearly the same level of cues. And those cues help shape the social interactions around them.