Gravatar Signup Encouragement Wordpress Plugin - Rating, Reviews, Demo & Download

Plugin Description
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This plugin shows a message with link to signup page of Gravatar (pre-filled with e-mail address) to commenters and/or users who don’t have gravatar.
Message can be shown to:
- unregistered commenters when they leave text input field for e-mail address
- registered commenters to whom their registered e-mail address is checked
- unregistered commenters after they post a comment in a dialog, to whom their entered e-mail address is checked
- registered commenters after they post a comment in a dialog, to whom their registered e-mail address is checked
- registered users in administration notices, to whom their registered e-mail address is checked
- registered users in admin bar, to whom their registered e-mail address is checked
- registered users on their profile page, to whom their registered e-mail address is checked
- users who fill registration form when they leave text input field for e-mail address
Options are fully customizable. See FAQ for more information.
This plugin is lightweight, it adds only one field in database which is deleted if you uninstall plugin using WordPress’ built-in feature for deletion of plugins. Also it will only load jQuery file to head of your page if it wasn’t already loaded by theme or other plugin(s). Checks for gravatar are done via simple AJAX.
If you want to speed up your web site and save on bandwidth and server resources, it is recommended that you also install plugin Use Google Libraries which will load jQuery file from Google AJAX Libraries.
In order to plugin works, it needs to be on server with PHP 5 and on WordPress 2.8 or above.
Screenshots
Settings form with all expanded options
Message shown to unregistered commenter on default theme with default settings
Message shown to registered commenter on default theme with default settings
Message shown in a dialog to unregistered commenter on default theme with default settings after posted comment
Message shown in a dialog to registered commenter on default theme with default settings after posted comment
Message shown in admin bar
Message shown in administration notices
Message shown on a profile page with option to show below ?Profile? header
Message shown on a registration page with default settings
Message shown on a registration page (multisite) with default theme and default settings
Message shown in a bbPress reply form of a Twenty Eleven theme in line with avatar