It is proper Netiquette to share genuine content with contacts. Do share good information.
A Social Media contact is a friend. There are variations of the friend status. Fan and follower for example.
Sharing genuine content with Friends, Fans, and Followers is considered respectful. Genuine content is personal content curated for contacts.
Knowing your online contacts allows you to share content you know they will like. Sharing with interested contacts shows you care about their interests too. It aligns your interests with your friends to benefit the relationship. It shows your thinking of them.
Share genuine content with contacts because it shows you care about the relationship.