If you want to have a private discussion with a Hub user, you may send them a direct message. You must be following the Hub user(s) you want to send a message to and they must be following you, as well.
To send a direct message:
1. Hover over someone's name in your Activity stream and click the Message button on their pop-up profile box. The Send Message pop-up box opens.
2. You can add additional people to your direct message by clicking on the Select People link and clicking the checkboxes next to the names of the people you'd like to add.
3. Type your message in the Message field. You can upload a photo or @mention people in your community.
4. Click the Send button. Your message will appear in the Communications stream of the person or people you selected.