If you are having an Instragram, Facebook, Google+, Twitter, Youtube, Vimeo or Pinterest profile which you would like to show to your customers you should definitely do so. Not only can it improve your google ranking but also make your customers happy to find more information about your shop including reviews, comments of other clients and pictures.
It is that easy:
Hit "Apps & Marketing"
Add the "Social App"
Enter your Twitter, Facebook and/or Pinterest URL (you find these in the URL bar when being on your profile)