Once you've posted content, it's a good idea to respond in some way to people who comment on that content. This can be as simple as liking the comment or it can be a thoughtful reply to the comment. One welcome change Facebook has made recently for pages is giving users the ability to sort comments chronologically as well as by "top comments" (determined by an algorithm based on quality). This has made it a lot easier for page managers to maintain a healthy flow of conversation and to ensure that nothing is missed. The new ability to include photos in comments (being rolled out to users over time) will make comments -- and replies to comments -- more engaging.