According to you, What makes a great community 🌟 ?

Have a look at some of the digital marketing slack communities for examples of what NOT to do. 30,000 users, and the average post probably gets less than one engagement! On a more positive note, a bit of gamification goes a long way (i.e. Reddit or PH!).

Clearly defined topic/theme of the community. For example, IH or reddit are great but the groups and subreddit specific to a topic are more attractive to me.