With Slack for FeatureOS, you can create FeatureOS posts from Slack messages besides being able to setup channel and personal notifications. Whether you are in a channel or a direct message thread on Slack, you can quickly turn that into a FeatureOS post with just a couple of clicks. You also know which post was created from Slack, and link back to the message from which the FeatureOS post was created.
Slack has a very powerful integration with FeatureOS, and you can read more about it here.