If you have a task that you care to get done then posting it to Slack(goals of LessWrong)/Facebook/LW Discussion works for reaching people.
If it turns out that you have projects that you want to promote where the present system isn’t enough, that would be the time to build a new system.
Using the existing channels is much easier than convincing people to adopt a new channel. If you want a new channel then a google group mailing list seems optimal for reaching people.
If you have a task that you care to get done then posting it to Slack(goals of LessWrong)/Facebook/LW Discussion works for reaching people. If it turns out that you have projects that you want to promote where the present system isn’t enough, that would be the time to build a new system.
Using the existing channels is much easier than convincing people to adopt a new channel. If you want a new channel then a google group mailing list seems optimal for reaching people.