On this tab, you can manage blog comments of all blogs on the current site. You can filter displayed comments using the filter above the list.
You can Approve (), Reject (), Edit () or Delete () items in the list. Actions can also be performed for more comments at once by selecting comments using the check-boxes, choosing the action from the Selected items drop-down list and clicking OK.
Detailed information about the Blogs module can be found in Developer's Guide -> Modules -> Blogs.