Get id of currently viewed profile

How can I obtain the user id of the profile I'm currently viewing (when it is not the logged in user's profile)?

I'm having the same issue in two places:

1) I want to place info from the currently viewed profile in the es-sidebar position of EasySocial (not the currently logged in user)
2) I want to place info from the currently viewed blogger in a separate module in the single blogger view of EasyBlog

Using php in a custom module, I figure it would be something like:

<?php

require_once(JPATH_ADMINISTRATOR . '/components/com_easysocial/includes/easysocial.php');

$user = ES::user($id);

echo $user->getFieldValue( UNIQUEVALUE );

?>

...but how can I get the $id of currently displayed profile/blogger?

Thanks for any assisance!