If you are playing this game on an Anrdoid Phone/Tablet, the Blue Back Button is not at the top of the social menu. This feature is only available on the iPhone/iPad version of the game.
I reported this the day after the game was released for the Android operating system, but to date this has not been fixed. I did receive a response from Team Lava support indicating that they are aware of this issue but again have not yet provided a fix. This GREATLY impacts play on the game. I can visit 5 neighbors on my iPad to every 1 visited on my Android device. I have only once achieved a social rating of 4 on my Android device due to this issue/slow play.