[RSS Feed/News] How to update custom user field?

[XenForo]

We know we can get user custom field value from the '$user' object -

Code:

$facebook_url = $user->Profile->custom_fields->facebook;

We also know we can easily update any user field using 'fastUpdate' method -

Code:

$user->fastUpdate('user_state', "valid");

What is the easiest way to update user custom field value? For example, I want to update the user 'Facebook' field value. How can I achieve that programmatically?

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