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This plugin you can show a different greeting message to your new visitors depending on their referrer url. For example, when a user clicks through to Digg Digg, they see a message reminded them to digg your post if they so wish. Another example, as a visitor clicks through from Twitter, they will see a message suggesting they Twit of the post and you are on Twitter. Can also be a standard greeting for new visitors (not matching any referrer URLs) suggesting them to subscribe to your RSS feed. Professional bloggers know that this specific suggestions on their blogs, increase their blog exposure and readership loyalty. The best of all, this plugin is compatible with various WordPress plugins cache, so you do not need to rate them. Even Smashing Magazine Using this plugin. Take it from the pros and download!

Features

• Show a different greeting message to your visitor depending on the referrer URL. You can add/edit/delete/disable these greeting messages as you choose.
• Greeting messages automatically get inserted into the top of your posts upon activation. There is no need to modify theme files.
• Ability to auto-insert greeting message to the top or bottom of the post.
• Greeting messages can be user closeable or not.
• Ability to detect the visitor’s search keywords from major search engines and automatically display related posts under the greeting message.
• Show a default greeting message even if the vistor does not match any of your configured referrer URL.
• Show a default greeting message even if the visitor does not have javascript enabled.
• AJAX greeting message in the frontend makes it compatible with caching plugins (such as WP Super Cache) and WPMU.
• and many more..

You can check more detail about WP Greet Box here