Add a status indicator on member profiles.
When a user is online, there will be a green light on the bottom right hand corner of the user's profile picture. In this image, only @lesley1 is online.
Here are the settings you can change for this add-on.
A simple add-on that lets users see when other users are online.
Active session time lets you choose how long to mark a user online even after they've moved away from the site.
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Minimum WP Version
Minimum PHP Version
Minimum Core Plugin Version