Choosing the Right Community Platform for Your Newsletter Readers

Hi chat - do you run a community for your newsletter readers? If so, what community platform do you use? I used to have my paid readers on Circle, but since ppl have to go and log in to it separately it isn’t an easy habit to create. Now looking at Discord but worried that the older gen / professionals aren’t native to it. Any pros/cons of FB/Discord/Slack/Circle/etc you’d want to share? Is there anyone here who has done several platforms at once?