21sys Karma 3 Created 5 months ago Recent Submissions 1. ▲ Block trolls and scammers on public Slack communities (chromewebstore.google.com) 1 point · 3 months ago · 0 comments 2. ▲ Block Trolls on Slack (github.com) 5 points · 5 months ago · 0 comments All submissions on HN · View profile on HN