With reference to Johannes Gutenberg, I am sure he did not come up with the idea without influence from his peers. Even if he did, the learning he did to make it happen was totally dependent on what was going on in society at the time and the needs of society. Therefore, that learning was social by nature.

The idea of learning through one's own senses is an intriguing argument. In theory, if child has had no contact with another person and uses only his or her sense of smell, touch, sight, or hearing he or she is technically learning something. I suppose a definition for "learning" would help us out here. Also, what social filters are in place when someone uses their senses to perceive?