Did the leaves fall off? Something not working right? Let us know how we can improve the Photosynth experience.
When adding a link to chat in FB, (the link Photosynth generates from the "Share" link on each Photosynth) - FB may remove the link and instead pass on a message saying " The attachment may have been removed or the person who shared it may not have the permission to share it with you." Go figure.
Hmm. I can't say that I've seen that before.
I just now tried to reproduce this bug on Facebook.com, pasting a 'Share' link into private messaging and then Facebook Chat (all on the site, not from any Facebook client), but the link comes through each time with synth title and thumbnail correctly attached.
As a side note, though, unless you want to get a link to exactly what you're currently zoomed in on in a panorama or a synth, you don't need to use the 'Share' link and can instead copy the URL that's in your browser's address bar.