To the right of a Team Page is Page Chat, where you can share ideas and give instant feedback related to the project or content on the page.
Page Chat is a conversation trail that provides a complete history of your team's collaboration. This can be especially helpful for new team members who need to get up to speed on what's taken place.
Simply type in the page chat field for a conversation with context. From here, you can:
To chat about a specific item on the page, hover to the right of the item to display the 4-bubble menu. Select the "conversation" icon and type a comment. Your comment will appear in the page chat, with a link to that specific item.
To learn more about editing or deleting your own previously posted chat messages, please read this help article.