Amazon: http://amzn.to/2gZ5pEC 
Social commentary masquerading as a Sci-Fi detective story. A planet of people avoiding human contact can only interact with each other via screens and their robots – uncanny and this was first published in 1956
Note: I realise now that the cover looks like a giant porn-star-bot having sex with a spaceship. I had this on my bookshelf for years as a child and it never occurred to me…