Create a Like & Follow button to share posts on friends feed

We have been looking for a plugin or code to add a Like button and a Share button to all posts people create on our site so they can share it with their friends on our site. But the only plugins we could find were to share content to other sites like Facebook. Have also tried to find code online to make our own custom Like & Share button but kept finding the same issue with only code for sharing posts to sites like Facebook