I realized that chatting toward a large group often sucks because it attracts unwanted disruptions from random strangers. The larger the group is, the more likely it is for conversations to attract unwanted disruptions from random strangers.

Chatting works best among a small group of people who have basic trust toward each other.

For a large group, posts seem to work better than chatting.

Ryver could be considered as an alternative to slack when clojurians is closed.

http://www.ryver.com/5-reasons-you-should-switch-your-slack-community-to-ryver/

But, I don't like the fact that ryver forces users to enter first name and last name.

My nickname is not composed of first name and last name.

The larger a chatting group is, the more likely that anyone who talks about a random topic is likely to attract a difficult or annoying person!!!!

Even if a random stranger is not particularly difficult or annoying, he/she is likely to waste your time by simply disagreeing and not presenting any new constructive feedbacks.

It's better to find a right audience. Posts in the right community are usually better than chatting for appealing to the right audience.

When a disagreement occurs in a large chatting group, usually the person, who has less specific purpose to be there and thus has less relevant knowledge on the topic, wins.

This is why people who have much less knowledge in the topic feel difficult. The larger the chatting group is, the more likely that you're likely to meet people who have much less knowledge in the topic.

This is called https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect

To avoid dunning kruger effect from others or yourself, find the right audience. Prepare communication.