Community management is everything that happens after you post: replies, questions, complaints, and conversation. It is less visible than content and often matters more, because it is where a following turns into a relationship.
Someone taking the time to comment or ask a question has volunteered attention. Ignoring it wastes the most engaged person in your audience, and it is visible — a page full of unanswered questions tells every future visitor what to expect.
Replies also serve a mechanical purpose: platforms measure conversation, so a post with an active comment thread is distributed further than one without.
When someone asks something publicly, answer it in public and answer it fully. "DM us for details" is a common reply and a weak one — it moves a useful public answer into a private channel where nobody else benefits.
A complete public answer does three things at once: helps the person who asked, helps everyone else with the same question, and demonstrates that you know the subject. That is a considerable return for one reply.
Negative comments feel like a problem and are usually an opportunity, because the response is read by far more people than the complaint.
A calm, specific, non-defensive reply to a complaint is one of the most persuasive things a business can publish. It is evidence of how you behave when something goes wrong, which is exactly what a cautious potential customer is trying to work out.
The presumption should be against deleting, with a short list of exceptions: abuse and harassment, spam, content that is illegal or discloses someone's private information, and off-topic promotion by others.
Criticism of your business is not on that list, however unwelcome. It is worth being clear with yourself about the difference, because the temptation to reclassify one as the other is strong in the moment.
Speed matters more on social than in most channels — people expect it, and platforms sometimes display response times publicly. If you cannot monitor continuously, say so: a note about when you are available sets an expectation and is better than unexplained silence.
Participating in communities you did not create — industry groups, local forums, subject-specific communities — reaches people who have never heard of you. It only works one way: contribute genuinely and consistently, and mention your business only where it is directly relevant and permitted.
Joining a community to promote is transparent, usually against the rules, and reliably counterproductive.