You can add Slack channels into Feeds.
Slack requires that you connect your account on the Your Social Connections page before we can pull in any content from them because all Slack data is private by default.
Channel: You can pull in all the messages (including media) from a Slack channel you are a member of. Provide us the name of the Slack account and #channel you wish to pull content from. We'll pull in every new message in there as they are posted. (A school Slack account will have to be connected to Feeds.)