Why portable Facebook Messenger?
It does not require any installation, must be useful when you don't have administrator access and you do not want to keep track of your chat on web browser.
It can works from any devices, include your memory card, iPod, portable disks, your USB or even your cloud storage or sent by email.
No one can track your activities since a portable apps will contain everything in its folder. It also does not leave any registry key or temporary file on the system.
It can't damage your system since nothing change when you use portable Messenger on your system.
Download it now and enjoy!