What sites do you use to share a link to a book or article among students?

If you mean sites where you can download the information you need and then send someone a link to download this file, then I can suggest to use this one http://www.linkibag.com/ . I like this site because here I can save information and give it my own description, search for the files I need by keywords and follow a clear file ordering structure. All this is a service with free access. The person who will receive the link from you isn't obliged to register on this site, but then he will have only 24 hours to download the necessary files. This really saves you time and helps you deliver large teaching materials to students in just a couple of minutes.

in our universe we use card or any messenger 

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