Full Idea
Ever since Husserl, phenomenologists and existentialists had been trying to stretch the definition of existence to incorporate our social lives and relationships.
Gist of Idea
Later phenomenologists tried hard to incorporate social relationships
Source
Sarah Bakewell (At the Existentialist Café [2016], 08)
Book Reference
Bakewell,Sarah: 'At the Existentialist Café' [Chatto and Windus 2016], p.197
A Reaction
I see a parallel move in Wittgenstein's Private Language Argument. Husserl's later work seems to have been along those lines. Putnam's Twin Earth too.