Recent Commentators

This widget shows latest commentator list on your sidebar with or without gravator icon.

Place the widget_recent_commentators.php file in your /wp-content/plugins/ directory
and activate through the administration panel, and then go to the widget panel and
drag it to where you would like to have it!

1. 

   Main View

2. 

   Option Panel

can i turn off gravator icon?

Yes, you can change setting on option panel.

where can i register gravator icon?

You can register gravatar icon totally free at following url.
http://www.gravatar.com/