Glass allows sharing photos through Twitter, Dropbox can save them. (As since Glass update XE8, Glass auto-hashtags #throughglass all twitter posted photos.)

This Trigger fires every time you post a new tweet with a specific hashtag.

This Action will download a file at a given URL and add it to Dropbox at the path you specify. NOTE: 30 MB file size limit.

Save photos taken with Glass to Dropbox via Twitter