> if others are really comfortable with the idea of uploading their customer lists to Google (or FB [)] Just to present a cynical point of view, it is Facebook

> if others are really comfortable with the idea of uploading their customer lists to Google (or FB [)] Just to present a cynical point of view, it is Facebook and Google. In America (and many other countries) Google provides mail servers via google apps or just directly on the gmail platform. I don't know the percentage so I won't invent one but I would argue it is quite likely that if an exchange takes place between 2 parties (the minimum for a convo) the traffic routes through google. Between facebook, chrome, gmail and android your customer lists are likely not private.