On a whim, I created a slack team for this community. It can be found at https://pro-minesweeper.slack.com .
On IRC, it's fairly easy to lose track of what's happening - if you log out and don't have a special setup, you lose access to discussions that take place when you aren't there, even if you do, reading logs is tedious, etc.
On Slack, you always see the complete chat history. Also, you get email notifications when people mention you, and it's generally much more likely that people manage to stay in touch.
Unfortunately, Slack doesn't allow open signup, however, I've invited a couple of people already and allowed any member to invite new people, so I hope that anyone who wants to join can do so quickly.
For now, anyone who would like to join can send me their email address (to thomaskolar90 ät gmail dot com), and I'll send them an invite.