Problem: In active channels, a post and/or thread can easily be forgotten and buried, thus leaving the conversation unresolved.

Proposed solution: I propose adding a feature that allows any user in the channel to mark a post as unresolved or as a team action. Any user would be able to clear the unresolved flag or mark an action as complete.

Posts that are marked as unresolved should have visibility in two ways:
1) A button to filter all the posts in the channel to show unresolved posts/threads
2) A collapsible side panel which lists the posts marked as unresolved/actions with check boxes. This would look like a checklist and would allow all teammates an easy view of action items or unresolved conversations and to resolve/close conversations that are completed. The side panel should be limited to only the unresolved posts in the channel the user is currently viewing.