For success in social networks you need to understand your audience. This will help basic psychological principles. According to a study by The New York Times, there are 5 main reasons why people make a repost.
To improve the lives of others. 94% of the participants in the study say that they share information that can be useful to their friends and acquaintances, to facilitate their life. Therefore it is important to create really useful content that bears the value of your audience.
To maintain the image. 68% of participants share certain content in order to create an appropriate image in the social network. When creating content, consider this factor - think about what content will correspond to the image of your target audience, and what they want to share with their subscribers.
To create and maintain a relationship. 4 out of 5 respondents say they share content in order to keep in touch with friends in social networks. Therefore, when creating posts, ask people to label friends in the comments, add an interactive like "pull a friend and win two tickets for the premiere" or "share this video with the greatest extremal among friends and win a balloon flight for two."
For self-assertion. Everyone loves when their positions are husked. People share content when they think that subscribers will appreciate it and put it "like". Create such posts that will help people to get approval.
"To tell others about what they believe." 84% of respondents said they share information to support their favorite brand, event or share, which they consider worthy and interesting.
These 5 factors of motivation prove that the main reason people post content is their relationship with others. Be sure to consider this.