Environment : LR 6 EE Sp1.
Add blog - portlet and TagCloud portlet to a community page.
Add multiple Blog entries.
If a user visits that community page he/she sees a whole list of blog entries. After selecting an item in a the TagCloud, the blog portlet views only the corresponding blog entries. So far so good.
It is impossible to undo the TagCloud selection, so the original blog view, with all blog entries, can be shown.