thoughts on a plugin - Hiddent Facebook Like plugin

What do you guys think of this?
http://www.icprojects.net/hidden-facebook-like.html
(by icprojects.net, Ivan Churakov)

Hidden Facebook Like plugin boosts Facebook likes of your WordPress website. It works like that. Once user clicks any link on your website, the plugin automatically generates Facebook like in case if user logged in his/her Facebook account. If user was not logged in Facebook account, the log in window appears.

The plugin generates Facebook like one time per visitor per 15 days.
You can try to click any links on this page and see that you become one of my likers.

The price of the plugin is 7 USD only. You can purchase it by clicking button below. Once payment fully completed you receive download link by e-mail (It is sent to your PayPal e-mail). This link is valid 48 hours only. If you have any questions, please drop them here.
Please note, if you have unverified PayPal account, download link will be sent with some delay (up to 24 hours). We apologize for inconvenience.

I haven't researched whether or not this is against Facebook's Terms, but it sounds smart but doesn't feel right.

Any thoughts?