The Explore page consolidates items others have shared with you or publicly into one view. Others' shared ePortfolio items display in a list that you can sort by name or date modified, ascending or descending. Filters at the top of the list enable you to view content by item type.
From the Explore page you can:
If you have permission to view comments or assessments on an item, the feedback activity icon [1] appears beside items when there is comment and assessment activity.
Links:
[1] http://staging.docs.d2l/en/understanding-my-items#activity
[2] http://staging.docs.d2l/en/taxonomy/term/3