MySynths is a FaceBook application that was released today that allows you to share your PhotoSynths with your Facebook friends.
It is a good start and I like the fact that it embeds the PhotoSynth inside Facebook (instead of just adding a link to the PhotoSynth page). What I do wish it could do is to automatically import all my PhotoSynths using either my account information or the RSS feed that PhotoSynth exposes. (Right now, you need to manually provide all the settings – url, thumbnail, description, etc.)
Another cool feature about this app – it is built on the Microsoft Cloud Platform – Azure.
Read more about the app at http://www.facebook.com/apps/application.php?id=114216030046&ref=mf and http://labs.speaktech.com/groups/mysynths/default.aspx.