What are the best social networks to create a community

Twitter is not really a group-like community but it has some fantastic tools to help grow an audience if you are starting out: - @ mention someone and they get notified - Most active users respond to @ mentions unless they have like 10K+ followers - Retweet helps amplify the original Tweet is way more common than other platforms - People jump into discussions, which can be toxic too though, but you can get visibility by participating - Easy to search #tag topics and contribute

What's the business?