For email and social you can swipe to the right to save for later or snooze (or tap on the ribbon icon in the message in the upper right).

 

Cloze will remind you based on the time you set and return the message to the inbox or social feed.

You will also see them on your Agenda as they come due in the Today and Upcoming tabs or in the Past Due tabs (if you are not able to take action on the day you set). 

 

Note: Items you have saved without a due date are listed in the Follow Up tab in the Saved section.