Create teams and #channels
Create teams for your company, your family or your friends.
Then, create project-specific channels for your coworkers and anyone you want to include in your conversations.
The best part? Drastically less email, no more CCing a dozen people on an email, no more hunting and digging through all of your email for what someone said, or an attachment you can't find.
Instead, you'll be more efficient, productive, organized, and secure.