The RSA Sustainability network use Slack as its main online system. The key features are:
We encourage everyone to use Slack so we have a shared common space. Slack is easy to use on mobile devices, and you can set up email notifications to alert you to conversations.
Sign in at https://rsasustainability.slack.com/ if you have an invite, or email firstname.lastname@example.org for an invite for yourself or someone you recommend.
Choose something like firstnamelastname for your username so people can recognise you easily. Add a photo or other image to your profile.
Review the getting started checklist for some introductory videos
Here's what Slack looks like on the desktop - example from Sustainability network
* Look through messages to get an idea of people's interests, then introduce yourself * Join any of the channels that interest you. You are automatically subscribed to #general * Check you have set up notifications to suit your preferences - details here * Get to know people!
* If you hit return while in the message slot, your message will be published. To create paragraphs use shift + return * Adding @ before a username in a message will send them an alert. @channel alerts everyone. Please use sparingly. * You can edit messages - mouse over the message in desktop to get message actions, touch and hold outside text on mobile * You can star messages to keep track of important ones * Add Google docs rather than uploading Word docs if you want people to read in the app rather than download. You can do this by pasting a URL into the message area * Use + beside Direct messages to add one or more people to a private conversation. This allows you to create private small ad hoc groups rather than setting up a channel * More tips here from The Next Web