I wrote a little app called Kwerty Gmail Notifier and put it on my site and on Github for anybody to use free of charge. Lately it has been getting a bit of attention on some popular download sites.
http://kwerty.com/Gmail-Notifier-for-Windows-7/
Yesterday I noticed somebody has posted it on Facebook and is claiming it as an exclusive, and offering a "pro full version". They link to a website where you must register to download. Once registered they ask you to pay.
http://facebook.com/note.php?note_id=123271001142680
They are trying to profit off of something I released for free.
I looked at filing a copyright infringement claim through Facebook, but they want my full contact details and they say that such information may be revealed to the infringer. I don't particularly want some guy in Timbuctoo having my phone number and address.
What is the best course of action for me to take to have it removed from Facebook?
You should always use a license for your software and state clearly who owns the copyright for this.