Communication about user feedback often happens across channels in a bunch of different tools (Slack, email, Trello, Github, etc.), making it hard to keep track of important discussion. Comments and @ mentions let you centralize this communication while still collaborating with your team, storing your internal discussion alongside the valuable data that's already in your Userfeed posts.
To @ mention someone, simply type
@ and begin typing their name. A dropdown will appear to help you mention the right person:
When you mention a teammate, they'll get an email immediately letting them know:
They can view the post and reply in Userfeed, or simply reply to the email (it will @mention the person who sent it to you automatically). You can distinguish in app replies from email replies under the comment: