I evaluated several marketing Slack groups to understand their engagement levels and community dynamics. I joined groups without entrance fees or long waitlists, measuring engagement in up to 12 top channels and counting new posts and replies daily. My experience with Email Geeks, a large community for email marketers, was particularly impressive, with high engagement rates and a supportive vibe. In contrast, Superpath, a free content marketing group, offered live Q&A sessions and a job posting channel, making it a great resource for finding work opportunities. The Product-Led Growth Community, which focuses on integrated sales and marketing with product teams, had a strong community presence but was less active than other groups. Growmance, a digital marketing group, lacked engagement and seemed promotional-heavy. I recommend joining niche groups that focus on a single specialty and look for even member coverage across channels to ensure meaningful conversations.