Facebook announced today, an experimental service (Say Thanks) that lets you say thanks by sending personalized videos to your friends.
The new service (when available) will allow you to choose a theme, photos and publications to create a video. Once you've created it, you can share it with a message on your timelines or your friend's timeline.
Of course, the website containing the tool still shows an 404 error, (facebook.com/thanks), but as Facebook reports the new feature will be released on duration of the next few hours.
