Socializing your dog is very important, to avoid bad or unwanted behavior from your dog, whether it's with people or other dogs. Socializing is much easier if you can start while your dog is still a puppy. Once it reaches a year old, you should continue to socialize your dog so it doesn't later develop unwanted behavior down the line. Even when life gets busy it's still really important to have your dog go on walks and have some interaction with the outside world. It will help your dog cope and react positively with any new changes or experiences down the line.
Here are a few links that go into more detail about socialization: