Find Number of Users Currently Logged on to a SharePoint 2013 Online using SPServices
Create sharepoint list with Name is WhoIsOnline.
Change Title to LastTimeUpdate. Create column user and group is UserName then input all user in your site collection to list (Note: LastTimeUpdate you can input text "Wed, 09 Oct 2013 08:40:48 GMT")
Download jquery-1.4.2.js and jquery.SPServices-0.6.2.min.js
Go to Settings >> Site contents >>...
