I recently noticed that my Google contacts started showing pictures and full names of some contacts, presumably because they were using Google Voice. I added myself as a contact, merely as 'X' with my G-Voice number to a second G-account. As expected, my full name and Google+ profile image came up in that second account's address book. I presume this can be avoided by some deep setting in G+, or may have something to do with Hangouts. Does anyone know how?