Your little one is just so cute, is he a sable coat?
Most definitely expose him to other pups/dogs once he is fully vaccinated.
Consider how you want to socialise him and work out the best way to give him good experiences.
With my next pup, I will avoid the local dog park and enrol him into obedience training from about 16 weeks, there he will learn leash manners, obedience and the fact that not all dogs need to be greeted, depending on the other pups there I may allow him a couple minutes of off leash play after class. I will also expose him to older very stable dogs. Other than that I plan to train him to ignore other dogs and that he does not need to play with them, meet them in order to be happy - we will do all sorts of fun stuff together.