"Oh, I don't have time to read all these interesting pages now. Can I find them easily and continue my reading?"

Don't worry! Diigo provides a very handy Read-later feature for you. 
  1. Click Read Later button on the diigo toolbar. 
  2. Check all your unread items in the unread folder of diigo toolbar or in "My library".
(Note:   same action as checking  "unread" checkbox on the bookmarking window.)

Here is a short "how to use Read-Later" tutorial: