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A Synth button integrated into facebook which would download your pictures and synth them , the button would only pop up if a synth Detection was detected that your photos could compose into a 3d synth , or panorama ,
Hmm... this would be welcome, but I wonder how it would work practically.
In order for "the button [to] only pop up if [it] was detected that your photos could compose into a 3d synth or panorama", it seems as though you would either need a Photosynth browser plugin that constantly monitored your activity when you browsed a Facebook photo album, used the Facebook API to download the largest available copies of the photos, perform feature extraction and matching, and then present you with a 'Synth' button.
The only other alternative, really, would be to have Bing Images examine every last image on Facebook for image features and always be crunching away trying to match the image features on the Bing servers. This isn't necessarily so far fetched, being that Facebook seems quite happy with Bing (it's their default web search engine, default mapping platform for Facebook Places, etc. etc.), but this would certainly be a large project.
I'm also certain that not being given photos which have been chosen by a human because they all belong to the same environment (as is the case when people make synths intentionally) would complicate making reliable matches between images. What would help is if you could geotag individual photos or entire albums at a time. If an entire album was shot at the same location, those could easily be cherry-picked for potential synthing, but I would be careful to have manual photo alignment ready for the Facebook audience.