Joe's new attitudes wherein he expected his mother to do his laundry and pick up after him when he came home for the summer is most likely a function of conformity.
Conformity is a kind of social influence where a person changes their behavior or belief in order to fit in a group. The change is a response to imaginary or real group pressure.
Social media gives access to communication between people all around the world. People may be afraid of reaction and hold back when giving feedback, meanwhile the feedback is more true to heart on social media, due to the lack of the fear of reaction.