Tags
Tags are labels that you can attach to items. They can help you find items with something in common.
Note
These tags are different than hashtags that you apply to comments in the stream.
Tags are displayed in the bottom of the left panel in a section that can be hidden.
Search for tags using the "tag:" prefix.
You can edit tags in List View.
Tags can be displayed in a Cloud View:
In either view, select the tag to view its associated items.