Google+, for all the criticism it has garnered from the "hip" tech crowd, has been an incredibly important product for the search giant since its unveiling back in 2011. Remember when you had to get an invite to join Google+? How far we've come.
But Google+ quickly became more than just Google+. The Hangouts messaging platform and, later, Google+ Photos were key leaps forward for Google in two areas where the company was arguably becoming stagnant.