"This is an area I have been experimenting in for about 7 months now - since just.me launched. I think one unstated truth is that the smartphone itself is becoming social in that it is able to deal with 1-1, 1-many and 1 - all interactions. It is increasingly important to dissect these sociologically too. 1-1 between friends vs strangers (same for 1-many). 1-all is almost always to strangers. Then from there to engagement between poster and reader. What the device/os does (Photostream; iMessage; email on iOS or Hangouts and email on Android) versus what an app is needed for is a key area to understand." - Keith Teare